ionospheric and radio propagation disturbances. october …october 1943 through february 1945. th.is...
TRANSCRIPT
IBPL-K13 IJBXB3EB.nCE RADIO PStCPiGATION LABORATORY ' NATIONAL BUHXAl 07 STANDARDS
Vashingtoa, B«C, Organised under U®So Joint Communications Board
Issued 24 May 1945
IONOSPHERIC AND RADIO PROPAGATION DISTURBANCES,
OCTOBER 1943 THROUGH FEBRUARY 1945.
Th.is report gives an analysis of ionospheric and radio propagation disturbance, on a character-figure basis similar to the K figure of geomagnetic etorminess, and a comparison of the XRPL forecasts with sub- eequedtly observed radio conditions,: The scale chosen is that of the IBFL Radio Propagation Forecast, where estimates of the grade or quality of radio propagation are given on the following scales
1 - useless 2 « very poor 3 - poor
4 5 6
poor to fair fair fair to good
? « good 8 » very good 9 - excellent
A number of radio traffic reports are regularly received by IRPL on the above scale. For the purpose of this analysis-- it was necessary to convert other forms of data to this scale, so that all the data could be combined into ionospheric character figures for local night and day conditions during the Greenwich day. The North Atlantic and North Pacific paths were considered separately® , ■
%
The data not reported on the 1-9 scale of the forecasts were con¬ verted to that scale by the use of frequency distribution curves of the data, divided into nine class-intervals,, Some of the reports already had the threshold level of disturbance determined; the Marconi and RCAG reports had such. For those where no definite threshold disturbance level already existed the data were split so that approximately 20-3<tf of the cases would be below this levels this agrees closely with the percentage of geomagnetic disturbance during that period, The conversion scales used are shown in Table X0 In all the conversions the maximum number of cases fell, as would be expectedD between class-intervals 5 and 6# which represent normal conditions. The distribution curve* for the moat part were skewed toward the normal or quiet condition Bide® Sinde the reports were so varied in nature, it was not found possible in meat cases to divide the class-intervals equally, but they were chosen to give as smooth a distribution curve as possible,, V. vu
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Several types of data were combined to try to present as complete a picture as possible of radio propagation conditions for each Greenwich day. The following agencies reported conditions using the 1-9 scale of the forecasts;
Alaskan Communication System of theU.S. Ansy; Royal Air Force at Bcrval, Canada
(reception from Goose, Iceland, and the United Kingdom) ?
(ever) Qn\
2
Royal Canadian Air Force (reception at Halifax, Ottawa and Vancouver);
Army Air Forces, North Atlantic Ferry Command; Churchills Canada (reception of WV (5,000 kc), Washington, D.C,
from 1800=0600 GST knd WWV (lQ0OOO kc), Washington, D.C. from 0600-1800 CST);
RCAC ratings of paths from Stockholm and Moscow to New Tork; London and Berne to New York;
Mackay ratings of paths from Moscow, Kaboul, and Bombay to New York aad from Europe to New York,
Other reports, using a 1-9 scale which was modified in each case to fit the frequency distribution scales, were included;
Ottawa, Canada (reception from Southern England from 0600- 1800 CST);
British Broadcasting Co„ (reception of BBC Stations at Portland, Oregon; Phoenix, Arizona; St, Loris, Mo,;
^ Cincinnati, Ohio; Indiananolis, Ind0? and New York0 ' . . N o Y o );
RCAC rating of paths from China to San Francisco; Mackay hourly signal strengths over path from Chungking to
San Francisco*,
Commercial system reports were included as follow®;
Marconi Co, rating of the Montreal to United Kingdon path; RCAC rating of the North Atlantic path; T,l)o Figures of theBell Telephone Laboratories,,
Radio traffic data, in the form of figure-of-merit ratings on a scale of 0 to 10 (0 representing no transmission possible and 10 perfect trans¬ mission), were used for the following paths;
Moscow to Nev; York; Chungking to San Franc! see <,
Radio field-intensity data were used in four ways* GSD0 JZJ, and WWV (10,000 kc) recorded at College, Alaska, were included by counting the hour* of transmission each day below the minimum reliable value of the recorder, thereby correlating disturbed comditions with a greater number cf hours below minimum* WWV (10,000 kc), as recorded at Reykjavik, Iceland was used by counting the number of hours of transmission equal to the minimum re¬ liable value of the recorder. Data for WVTV (2,500, 5,000, 10,000, and 16,000 kc), as received at Kodiak, Alaska, were used by counting the number of hours of transmission on each frequency and combining the 2,500 kc and 5,000 kc for night conditions and the 10,000 kc and 15,000 kc for day condi¬ tions*, GLH, Derchester, Englan (13,525 kc), received at Riverhead, Long Island, N*Y», #as included by using the percentage of hours of transmission for the day for which the intensities were less than the median values of hourly intensities for the months
Finally, ionospheric data, in the form of a measure of auroral-zone absorptions was used by totaling the (minimum received frequencies at
<«V
3o
vertical incidence) for alternate hours of the day at College,, Alaska,, Also ^ths tot&l number of hours of f°f2 reported from local noon to local noon at Church ill„ Canada0 which, as stated in IBFL-C17„ correlates well with radio disturbance^ was included0
/
The conversion scales for the various typesof radio propagation data are shown in Table lc For analysis,, the data were divided into four groups; North Atlantic local night (0100-X20C GCTD North Atlantic local day (1300-2400 GOT)0 North Pacific local day (0100-1200 GCT)„ and Horth Pacific local night (1300-2400 GOT), Character figures derived from the conversion scales were averaged in each case. The half day wae considered disturbed if the average figure was 4 or lower and a quiet day if it was 5 or higherc Tables 2-5 are sample tables of the converted reported radio propagation data for each case.
It i® at one© evident that there is no unanimous agreement among the reported data as to what the quality of radio propagation is on a given day. On a day like 16 Dec, in Table 3„ for example,, where 16 out of 20 reports wefe only "fair" or w©r®«0 and two reports were "useless"„ nonetheless four reports were “fair to good* or better, On the other hand0 on a day like 26 Dec., 0 where 18 out of 20 reports were ‘"fair to good" or bettor,, two reports were still "fair* or worse, Even reports over the same paths do not always agree; on 30 Dec, the BCAC London-New Tcrk rating was "good* and the A,T, and T, "TD" rating was only "fsflr to poor*, Any overall radio propagation quality rating therefore can be at best only a "consensus® ratings i,e, „ if moat observers agree that conditions are bad„ the day is probably disturbed. Hence the average of all reported ratings,, convert#d to a common seal®, was adopted as the raiio propagation quality figure for the day.
Tables of the type of Tables 2-5 were made0 including all data re¬ ceived for the period October 1943 through December 1944, Tentative tables for the North Atlantic path for January and February 1945 were also pre¬ pared.
Tables 6 and 7 list the radio propagation quality figures by days and months for the North Atlantic path and the North Pacific path, respectively* Disturbed ratings are those of 4 or less and are indicated by figure® in parentheses. Table 8 lists the geora&gneideally disturbed days based on an average K. figure 2-5 for the Greenwich day. There was a higher per¬ centage of geomagneiic&lly disturbed day® than days of radio disturbance. During the period October 1943 through February 1945 there were 27$ of the former as ©gainst 20$ of the latter-based on the North Atlantic path ratings. The coefficient of correlation for the North Atlantic half-day rating against th© corresponding half day &A suss wae 0,6294-0,0127 with the standard deviation of the sum from the lime of regression of 3,13, Fig, 1 shews this graphically, Tf th® KA sum for th® half day was 11 or greater0 the probability waa high, that th© day wae one of radio^pro* pagation disturbance, Thers were daysof geomagnetic disturbance not accompanied by radio propagation disturbance. There teams' io be some tendency for severe geomagnetic and radio propagation disturbance4^©'fee coincident,, but after the geomagnetic'conditions become quiet,, moderate to slight radio propagation disturbance lingers on.
The graph of Fig. 2 shows ths percentage of days of radio propagation disturbance month by month. for the Borth At lactic and tho Borth B&cifie path*, .respectively. It illustrates well t&e fact that from June 1944 on there were comparatively few disturbance* compared to the period up to then. During the period October 1943 through Hey 19440 when disturbances were re¬ latively frequent,, the graph for-the Borth Atlantic ratings indicates greater occurrence of disturbances during the equinoctial p»riod®9 the peaIr of oaxiaRua disturbance being in October 19430 with a secondary p£&k in March 1944. The rise in December 1944 and January 1946 can be attributed to a greatly increased amount of solar activity during those months. A sunspot group of area greater than 1000 Billionths of the sun6® disc passed the sua8a eentr^. meridian on 13-14 December and was associated with the great iono-
. sphere storm beginning on 16 December.
Fig. 2 shows <s2 so that9 except for January 1944 and December 1944„ there were appreciably $©rc disturbance© over the Borth Atlantic path than over the North Pacif ic one? fro® October 1943 through D@ce®b©r 19440„ 21$ of the days were disturbed for the forser as against 14$ for the latter. An explanation of this sight be that- 50$ ©f the Borth Pacific path ratings sir® based on the Chungking to San Fr&neise© path. Although this is a very long path with sharp contrast periods at sunrise and sunset ®ad henc© very sensitive to disturbance,, it ie not as auroral gone path such as those used in the Borth Atlantic ratings. Thus0 disturbances spreading out fro® the auroral none would not ordinarily affect this path a© soon as they would Borth Atlantic path®, there wear Id b© fewer Borth Pacific disturbances, and they would tend to lag behind th® Borth Atlantic ones. Th@ disturbance ratings seara to bear this outs for example,, the disturbance pattern b@= ginning 23 October 1943 for ths Borth Atlantic begins 24 October 1943 for th® North Pacific. It should be pointed out that fewer ratings are avail¬ able for the North Pacific than for the North Atlantic area, and thus the ratings ar® less reliable. Here data need to be available before such as effect can b® definitely established. T«ry severe disturbances see® to spread rapidly and are ee&acident foe both the Borth Atlantic and Borth Pacific paths.
Beeurrenc* tendencies are shown in Tables 9=22 and in Fig. 3^ thee® are based on the Berth Atlantic radio propagation quality figures. In the tables th® disturbed half or whole days indicated by D are listed on 26~0 27-„ 28- and 29= day recurrence patterns, Th* 27~day table shows two sore recurrences than th® SSs-day table and th&se two tables are definitely better than either the 26- or 29- day tables. The pattern of th* 27„<iay table was
beet in grouping the disturbance# in one part of the cycle rather than scattering them throughout the cycle. Until May 1944 the 27-day recur¬ rence tendency was quit# pronounced,, but after that month, while passing through th® end of the current sunspot minimum, there was no evident re¬ currence tendency. This ie also shown in Fig. 3 which wee conetructed by using the superposed epoch method,, combing the Borth Atlantic half-day radio propagation disturbance ratings, before and after disturbed days, for th® two periods October 1943 through May 1944 and June 1944 through Febru¬ ary 19450 respectively. la the first period the disturbances recurred 37- to 262 days lat*r0 but for the second period no recurrence was evident. The overall degree of disturbance ia shown by the mean average quality
figure* for the two period* » 5.05 and 6.05 respectively. The periods also chow a contrast in that for October 1943 through May 1944 the pattern of disturbance around zero day is much broader as well as reaching a greater percentage deviation from averagev Indicating a greater degree of die-, turbance. The 0100-1200 GOT part of the day is much more disturbed than the 1300-2400 GOT part in each of the two cases.
Tables 13-28 show comparisons of the Horth Atlantic and Horth Pacific radio propagation quality figures with the IEPL warnings and with the IEPL A~zone short-tiAe forecasts„ and comparisons of the ISIS warnings frith the Horth Atlantic ratings. H (hit) represents a quality fig?ire of 4 or lower
• for a half or whole day for which a warning was given or for which the fore¬ cast was 4 or lower0 M (miss) represents a quality figure of 4 or lower for a half or whole day for which no earning was given or for which the forecast was 5 or higher. 5 (good) represents a quality figure of 5 or higher for which no warning was given or for which the forecast was 5 or higher. S (superfluous) represents a quality figure of 5 or higher for which a warning was given or for which the forecast was 4 ©r lower0
Table 13 compares the IHPX. daily radio disturbance warning with the Horth Atlantic quality figures. Except for the months of August and September 1944® the number of correct warnings or no warnings were considerably better than random choice of disturbed days. Th© failures of those two months is explained by the fact that during those months there were hardly any dis- turbances0 and thus„ on the basis of the recurrence tendency which had been well marked until theno many warnings were given. The series of s5* warnings in the middle of September was due to the expectation that the first sizeable sunspot group of the naw cycle would be followed by distur¬ bance o and it was not. Howeverc in the total period® radio propagation conditions were no better than fair after 46$ of the *3* warnings. After October 1944 ao disturbances were missed in the warnings? in that month® and subsequently!, the use of the addition of visual magnetograph observa¬ tions and direction-finder observations over the Horth Atlantic path to .the other geomagnetic® solar and ionsopheric data received on & daily basis greatly improved accuracy of the warnings.
Table 16 compares the I SIB warnings with the North Atlantic disturbance ratings. It will be noted that the XSXB issued fewer warnings. However^ in the period subsequent to October 1944 the ISlB missed seven disturbances whereas th© IKFL misaed none. Also® aa stated above, many of the •‘S* warnings of th© 1B.PL were followed by conditions no better than fair so that there is some justification for their having been given.
Table 19 compares the IEPL daily radio disturbance warnings with the Horth Pacific quality figures. There were fewer Horth Pacific dis¬ turbances and although almost the same percentage of disturbances were warned for correctly as in the case of the Horth Atlantic ratings0 there were far too many *S* warnings ^iven for this path. This is understandable in that the daily IEPL warning is based for the most part on Horth Atlantic data. This indicates that® in order to eliminate the issuance of so many "S- warnings for the Horth Pacific area0 it would be advisable to set up a warning service for that area at some point on the Pacific coast® making use especially of up-to-the-minute direction finder observations® geo¬ magnetic observations® and local ionospheric data.
ok)
6. Table 22 summarizes the data shown in Tables 13-21. It will be noted
that in the period February 1944 through February 1945 the IBPL correctly forecast a hieher nercentage of the disturbed days than the ISI3; this is especially true since October 1944o On the other hand the ISIB have correctly forecast a higher percentage of good or quiet days,, As stated above, most of the HS8 warnings.of the IBPL were followed by days that were only fair; warnings were given for 51$ of the fair days by the IBPL as against 19$ for the ISXBc The geometric mean of all days correctly fore¬ cast is 70.6$ for the IBPL ve<> 73.9$ for the ISIB0 Therefore if the user is interested in being warned beforehand of the probability of disturbance to follow, the IBPL daily warning was preferable, but if he is more in¬ terested in having quiet days correctly forecast the ISIB warning was pre¬ ferable. The IBPL daily warnings against the Forth Pacific quality figures show only a slightly smaller percentage of (disturbed or good)® days in¬ correctly forecast as compared to the Forth Atlantic quality figures but a ver^ great increase in the number of good days for which warnings'Were given, since only 29$ of the warnings were followed by fair conditions,, This again indicates the advisability of a Forth Pacific warning service from some place on the west coast0
Table 23 compares the IBPL-zone short-time (weekly and serai-weekly) forecasts with the Forth Atlantic radio propagation quality figures. During the period October 1943 through February 1945 65$ of the days were correctly forecast for the North Atlantic path. During the period through May 1944 comparatively few disturbances were missed. After that month, however® be- cause of the failure of the 27- to 28-day recurrence tendency, the pro¬ blem of forecasting four to ten days in advance was very difficult,, Sta¬ tistical solar relationships of disturbance expected (a) three to four days after appearance of high green line coronal intensities in the east liab of the sun® (b) four days before up to central meridian passage of large calcium-floccular regions, and (c) two days before to three days after central meridian passage of large area sunspot groups® were used as the basis for radio disturbance forecasting.
These relationships were worked out on data obtained t oward the end of the last sunspot cycle„ involving low solar latitude regions for the most part, and are shown graphically in Fig. 4. Similar analyses0 shown in Fig. 5, for the period Octover 1944 through March 1945, nhov much less de¬ finite correlation, during that period, of disturbances with high coronal intensities or large area calcium floccular regions. The coronal relation¬ ship apparently shifted to seven to nine days after east liab appearance® and only the period from two days before through central meridian passage of large calcium floccular regions tended to be disturbed. The large area sunspots indicated a pattern of disturbarice beginning at the day of central meridian passage rather than two days before as in the earlier period. At the beginning of the new sunspot cycle the active solar regions are mostly in high latitudes® and this possibly explains the change in re¬ lationships. The fewer number of disturbances after May 1944, together with the apparent change in solar-radio relationships, explains^ the difficulties of forecasting in this period.
Cut)
7
As with the daily radio disturbance warnings» many of the fore-* caste were for days with no better than fair conditions.. In general the forecast ratings for disturbance were not displaced by more than one to * three days, so even though the exact day of disturbance was missed the general period for expecting disturbances wasn on the whole,, correct,. Until the 27- to 28-day recurrence pattern begins to be evident again,, or the solar relationships more pronounced,, the semi-weekly forecast has to be considered as merely indicating the general period likely to be &is» turbedo and the IKPL daily warning revises the forecast as needed. During the period from October 1943 through February 1945 65$ of the days were correctly forecast for the North Atlantic path0
Table 26 compares the IRPL BAB~zone forecasts with the North Pacific radio propagation disturbance ratings. Since there were fewer North Pacific than North Atlantic disturbances there are many more MSK forecasts,, as in the case of the daily warnings, but the majority of these were on fair days0 A higher percentage of disturbed days were correctly forecast for the North Pacific pathc probably because there were fewer disturbances for this path. During the period from October 1943 through December 1944 63$ of the days were correctly forecast,.
The correlations of the half-day radio propagation quality figures with the IEFL aA0=.zon« forecasts for the North Atlantic and North Pacific case9 1300-2400 G-CTo it is seen that the forecast tended to be a degree lower than actual conditions whereas for 0100-1200 GCT„ which are the more disturbed hours,, -tne agreement between forecast and observed conditions was greater s, as should be expected. The correlation between, the forecasts and the North Pacific radio propagation disturbance ratings were somewhat lower,, as was indicated by the discussion above. In this case the forecasts were more severe than observed ccaditions. This should be expected from the fact that there were fewer North Pacific disturbances observed. The best fit of forecast and observed conditions was for the North Atlantic,, 0100=1200 GCT0 (local night)0 This was the most disturbed of the four cases,. In evalu¬ ating the correlation it should be remembered that the purpose of the fore¬ casts was to cover radio disturbances rather than quiet conditions0
Further studies of relationships between solar activity and radio disturbances are In progress) and it is expected that better statistical relationships will be discovered. As the new sunspot cycle progresses it is to be hoped that the 27- to 28~day recurrence pattern will again become evident and of assistance in improving the forecast So
As the radio data become available North Atlantic and N0rth Pacific radio propagation quality ratings for each month will be prepared and issued regularly in the IHPL-F series reports. As more data become available it may be necessary to change the conversion scales which were used in this report. Such changes will be reported from time to time,, as necessary.
The radio propagation quality ratings as described in this report are issued in the hope that they may prove useful in analysis of radio pro¬ pagation conditions as affected by geomagnetic and ionospheric disturbances and solar activity.
(n 7)
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ftmr*
Mo. of tiro. Root to
no*>o C8T v*. vj»—• p 5>y
H«ir, of Ta «t
AnrchUl, ^Ulda
Average of actual conditio© report*.
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»»» (5 Ho l*XVOfc)f> 08! mJ 10 Hi 0600.
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S^sort,
Average of 0100-1200 CCT aad 1300-2U00 OCT.
V» «■ ^\K WM IVi M NH H H* p
’°3i?395,r a Par is*0'
Karcoal Battaf, Moatrml to U.K,
A▼ ora£ti of 0*00-1800 2*? *ad 1500-0f>00 WT- 2 values
for etch.
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HCAC ■. A%laatio
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Average of 2 valuac for OSOVISOO and 1800-0600 S*T
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Stoeicbola ^London
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traffic logs. © »■• a» nr a- 0 **%-—« 05 ^
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Moscow to lt*w Tos*k figure of Merit
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T.2>. figures (Bell Ub«.) <
So. of hr*. tt *1*. recordable value
^■fry^Tfro
>BS5KvS*'v-
2SP at Collage,
Alack*
Hour* received— -
2.5 **<1 5 Me oonvsrted values averaged for 0100-1200 OCT
0 r y y- — - w «■ <7no-jj ^ er
Z X ts P^? 3
m 2.5 Me at lodlek, Alaska
WWV 5 SO at
Kodiak, Alaska
10 tad 15 Me oor,verted values averaged for 1300-2400 OCT.
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O V uj f <r> —) ca vjd
•6
^9? 10 )fe at
JfcHiak, Alacica
WJRT lfl » at Kodiak, Alaska
Average of Ooooe My 6^*5 at*
John's to Halifax, Halifax to Ottawa, Prince George to
Vancouver.
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Canadian fiat lugs of bcap
Ar. of reaeption of U.k. at
Portland, Ore.. Phoenix, Arts. St. Louie, Mo, Indianapolis, lad., Hew York,
HHW(\JWWo<^ f\>J -fT sR vR \R VR <T< O'
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British Broadcaating Co. Batiagts.
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ffWV 1G Jio at
Hoykjavik, IcoIolC Ho. of hr*. £ min. recordable value
'% of hr 9. of field <
oedlan value S r p’ p
VO GLH at Hirerhaad, 3.T.
Mo. of hro. «S din.
recordable value K^^rypryr
^H2!rlv'0ffNiy
tf«Tf 10 Me at College,
Alack*
QtoO-lSOO 1ST
Average of 2 value*
-B-O »-<rV)v^4 O' vR (TV -.(OB Ottawa, Canada, to V B-agland
Total of 12 hrs. fnia. !o P 3 ^ 3 ^ p VO yv tr p
VO vO '0 >0 vO -O vO vO
Collage, Alaska
Abeorptloa
Average of 2 values eaoh
ob 1-9 scale
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f >0 yi F v^) Y’VO vO *■ -R
_^_»-pru*-y»fV)VHVH^" p'-R Y’ tr«>R _g tr
V V^» Vy.CoyvCo V Vyi Cr
ECAO Chlaa to C.f.
2000-0600 PW
RCAC
Cblaft to S.f.
0800-2000 m
Average of signal strength values on 1-9 scale
oOr-^-fur'v^M f?-* sr <r%vR —j -j
.^, y r- p ory r-yi p-yv ary ^y a-y vR
O 0 “ h^i w f ruiji (rx—< 00
XHjjpjpoorp *ry \o y 0
Mackay Chunjjtittg to &.f 0100-1200 OCT
Itiokay Chungking to 8.F.
1300-2**00 OCT
Average of 12 hourly values fro* figures of iwrit from
traffic logs
<-.°pr r.'r r°.~yr,yy.r'fyy-g ^ vo r<p Pv^> '^^*'0^'® vo
^ N^NNwWwvjicrcrxr cr>vR ^ —4
xr •RyrupsOyH'pf-p c'y vo y
Chungking to B,F» 0100-1200 OCT
Chungking to 9«f*
1300-2400 OCT
Mo, ef hr# < nla.
recordable value —r yyfyyfpp
J2J at Collage,
Alaska
At reported.
Me oka r Mat lags,
Alankaa Comeualoat lent
Systea
(//*)
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tiifb
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Liu roiyfuwroMwwrowHHHHHHHHiJH HOvflMN A A PA to t-1 O vO OQ A A PA to HOU)C«-J A A PA to H* Day |
1
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Churchill, Canada
-•• • WWV ■d Mc(l??()0-0600
<r> pa a a—4 oq —4 —4 a a pa A--4AtoACQv£>—j—4 p o> a a a "p a oq CST) Churchill, Canady
/^N /-V X“*v /-V X /*> /^v /-S /-V r -r cr»cr\ cxnvji vji vji -Ti^ ojvji qji crs cr\ cnui -P* -P' tr'vjn oi cr> Marconi-Montreal to
U.K. 0100-1200 GCT
a Paa ji oa os oaui cna a ro rv^aa^a Ch'ji a a a a a a a p a cr> p RA? Donral to Goose, Iceland and U. K„
<ji kjn oi v-H oi o^oxjn ctnoi cj> ct> <x\^i qji sji vji cr* North Atlantic i Command
c» oq oa a oq oq oq oq a a a a a a a pppoqoqcssoqoqac>qc«oqoqoqoq oq RCAO-North Atlantic (1800-0600 SWT)
^xn 00^ ■P' ^ ro_^ *-• ro rv^A p aa a a^ -^sJ1 a^J^a w,*-* ^ RCaC Moscow-Stockholn to N.Y.
a ‘A -a i-j a—4 a a aaa iv) w h ro oi oj o> a—j -o^i m pa pa a p p a RCA London & Berne to N.Y.
aapppoq—4-^1 a—i —4 tA pa ro -o a a oicotsjiiM^i-oJi-o a—j ca—-i ^ackav-Moscow, Kaboul, Bombay
-0-0 0101 CA OQ —1 —0 —-0 OQ —0 A A PA A A A-—4 M 05 K-D CD —1 A -«J —4 OQ —1 OQ Mackay-®ur o peaa
—4 A—i OVVfl '-O \D -X) 05 '40 vO —J —4 A AA —J PvO 05 —4 oO A A A—4 05 A AA A “'-A-' •
Moscow to New York 0100-1200 GOT.
pa ro^ro^ ro on a a a a p p P p r\pw-^—4 a—4 oq oq ca ca ca oq -j —■4-o~o~o oq T.D. figures
-Pa pa a —o a a a a PPtotototototoAA a-o A-^a a p a pa a —4 W ■'—* W W' >-' ^ --"-- S-^ w 'XA' ---
GSD at College, Alaska
>-*. ✓x. • cr\ r\j —i oq oq '^ vji P' »-* r\} ^ cr\ cr\ crs cr>—Q cts^j ^ \-n ^r\ ~^s -*>i -^j
*WV 2.5 A 5 Me at Kodiak, Alaska
Oft o* oft oq on cr\~^ -^] crv -P'vr cq -P'vji oq cq cq oq^-O o> oq vo vO cqc^ct W ’w'
Canadian Ratings of RCAF
P" ro pa p—o —o —o a pa ro^ro ro a a a—o oq a-oa aaa a ^p—o,a British Broadcasting Co, Ratings
AAA PA —O —4 —4 A A A A PA A A A P A-O —0 —4 -^4 AAA A A A A A vv ’a' sy
Average Quality Sigures
North
A
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Radio
Pro
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n Q
uality
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days
MMWfUfyWrUNMfVHKHHHHHHKH h Ovfi <r»oi p"vh who co oft —4 cr>va w h O'O m-~j cr\^r f \_h r\> >-> Day
01 P" ji 4T \n cr»vri cr> crs cr>vn o^v-n ro vr ^jn vrt P" cr>\.r <r>on on ctsvji vji on vjivx p"vr v-^ w» v-/ >—' ^
Hrs. of ?2 at
Churchill, Canada
WV 10 Kc (ObOO- CTi V P"OTl ohCQ —PONHFOilXIM'JM-OOSOMXMJl-sl 1800 CST) Churchill,
Canada
OlCA^CttrG'oQOaCfcOQOQOQOa^^r^P^CfcOQCQCSOQCttOQCfcOQOSiOQOQCAOQCtt Harconi-Montreal to U.K. 1300-2^00 GCT
RAF-Dorval to ctv(jm» cs h « oj oa->i *>j ca-^ <jn ca m r-*4 cu-j oq-^j cq —4 croqcq^joq ca ct o> Goose, Iceland
and U.K.
Olv-71 -vjn v71 VJ1 CA CA CA GAOl ^\J1CJ1vJ1CJ1\J>VJ1'OV'G1 CAvJl CA <A CA CA'JI <T\ vJI \jy ca MF-North Atlantic
C^CQOQCW-P'OQCflCROQ (ACA VJ1 P* -P rV) PU -P P vA C&OQCQCKlCAOQCSiOTOQOQOQCfc HCAC-Horth Atlantic 0600-1800 KWT
>nj w h c9 oj —i Fcncr>Jir\)NHHMo-^-g->iM«ji-oKjj cTv on h w _n RCAC Moscow and Stockholm to N„Y.
jjn'onaarocQC^OQCQ^j—j-^-^^nj^oQCQOQOQC^crNOQCJQCQCsjc^aioaoQCQ W >-/
BCAC London and Bern® to N.Y.
X-*H X-V ca ca P P raa-^*^ ca—4 -4 ca Pui ro -4 cava vjioqoqoqoq—4-4^-^j ca—4 ca—4 Mackay-Moscow,
Kaboul, Bombay
-JolOIOI CT> 09 -4 —4 06-oi CTion ~h (Tv CTN —4 04!S0avOIS->l011->l--J0(-OM Mackay-Kur0peas
09 —i-^iooonoOoO'sOoooooD o^od <jN-P"cr.oson 09 40 -.o oaosoo^o—4—~iooon—j—j Moscow to New York 13OO-2UOO OCT
■P'on rvj ro fV! on cr>on or ffiFFFFWo»<-i cr\-4 noooiWMWoio-^-o-oji TD Figures
-F"oT iron v_h —4 cr\ cr\ cr>oT P'-C'ruru rorororoorc^ <T\-oj cr>—1 or p ji p" ‘_r —4 GSD at College,
Alaska
Z*—' /-*• X-*o Z-» /*s Z-V 1 V_4 P f\) r\} CA CA—4 —4 v-Tl CJh CA ^ *“* ru P_—4 kjl CAvJl 01 -O oT» CA (A CA (A —4 —1 CA CA
WY<V 10 i 15 » at Kodiak, Alaska
09 09—4 OOJ1 CT\ 09 00 04 CT\ -4 —1 CTiP'oT 09 P'01 09 09 09 0900 04 C9 —4 oO -£> OJ 04 04 W v-
Canadian Rating® of RCAJ
pr ro P"on p"—4 -4-4 (tfji F"r\jrxjf\jrojion oo—j 09 04-u ji cn<r ji cr f-4 ji British Broad¬ casting Co. Rating*.
z—■ z—V <j\ ovjh P—j c* -4 (ThCT\ojiv^ ca P ca ca vji v_ji ca—j —4 caa ^a crioi va oavA a ca
w "
OT 10 Mo at Reykjavik, Iceland
<-- Z“4» —S. z*. /“V Z—4 a p^j ca r\j -4 ca—j ca^a Pro P\>j ro p—j —4 —j oq oq oq c* oq—1 —4 ca-4 ca—j oq
>wZ >-/ W >-z >✓ %✓ >—Z >-✓ /
GLH at Riverhead, N.Y.
Z-S Z-—4 Z*4 z*> Z^. z^. p pa ova —j —: a —j a <a p\>) p a a ca ca—4 —* —j —4 —d oq a> ctn crv ctn cn
*VV 10 Me at College,
Alaeka
«roT f>j 04 p" or or or p^ororor P"oh or cr^ ctnot —h i —4 -o ctjioti—ion fji ji s«/ xz v.y \.z vz w w v—'
Ottawa to Engiand 06O0-IgOO CST
4j^ vjn V^TI on J —4 —4 CT\ 0~N CTv Gn'sJI p*^z4 P' —4 *-4 —4 -—4 —J —4 CT\ CA—4 CA CJN-4 Arerage Quality
Figure
s* o (*
H-
a
cy r-*
■^>4
No
rth A
tlan
tic
Rad
io
>> a «
1 2 3 4 5 6 7 8
9 10
11 12
13 14 15 16 17 18 19
21 &2 23 24 25 26 27 28 29 30 3L
(
Table 4
North Pacific Radio Propagation Quality Figures Local Day 0100 - 1200 Q-CT_
jar 1944
o
1 ft
4-> O
W <3 ei •H CO cs Si t( H a M to a}
S H d <S S 4->
O E-C -r*< 03 -V O e»o co
w §, A 0 -H 0
© <s£ ®
1—1 a cn
13
-»-> (~t <—t < a
0 O >»
O CO § 0 O
fcfl c r-t O
<* 28
0 0 d 0 •*» E-t O 0> 4-> C C0 ■H S! vl 0 W ft C3 C O CV >5 0 Js*f <*"! d dJ -»-> (3 © u ~t 0
C to 1—* 0 ci a .
fe£ O ©
g § E iH tSS a! -<•> <U 0 0 ft ►-3 cd O X rH (C O CO
Jf to X! d ft tSJ <-t
0 0 « 0 0 ft 0 *"3
6 6 5 5 (4) 5 . 6 7 6 6 5 5 8 6 6 5 6 7 6 6
. 6 6 7 6 6 7 6 7 5 (4) 7 6 7 6 6 7 6 7 5 5 6 6 7 5 6 6 6 (4) 5 6 7 6 (4) 5 5 7 • 6 (4) 5 (3) 6 6 7 6 5 6 6 6 6 6 6 (2) 7 5 5 5 (2) (1) 6 7
(3) (2) 6 (3) (1) 5 (2) (3) (3) (3) 6 (3) (2) (3) (3) ■*»
u 6 (4) 5 (4) (3) & 6 5 6 5 (H) A 6 (4) 6 6 (3) © 6 (4) 7 6 (4) S3 6 6 (3) 5 (4) 7 6 5 (4) (3) 7 6 (4) 5 7
(4) (4) 7 6 7 6 (4) (2) 6 (3)
(4) (4) (3) 5 (4) (4) (4) (3) (4) 5
6 (4) 6 (j) _ U)
disturbed days
Table 5 '
North Paclflc Hadio Propagation Quality. Figures Local Kirtit 1300 - 2400 OCT
Decent er 1944
1
>» & A
lask
ran
Com
mun
i cati
ons
Sy
stem
v* 00
§ c
O o
^8 o o on tv
tvO
Sc
o O >, r*. cu aC ° a: w> q o o Sj O Jt
ae +» OJ
o *> 00 f-« ti £■«
O © o a <5
I! O
a o 5 1 23"
§ a§ 23 ■vf O «M r-4
® e*o ©
fH O
CO X
** X s> w
>1 cC CQ 1-4 *■3 ^
10 a>
i
>> *r-1 rH
1
1 6 7 6 7 6 2 6 8 6 7 7 3 5 7 6 7 6 U 6 7 7 6 6 5 6 7 6 7 6 6 6 g 6 (4) 6
7 6 7 6 7 6 s 6 g 6 7 7 9 6 8 7 8 7
10 * 6 9 6 7 7 li 6 6 5 (4) 6 12 6 8 7 7 7 13 6 7 6 6 6 l4 6 g Px
J (4) 6 15 (2) S 5 (l) (4) l6 (2) • 7 (3) (I) <p
(3) i? (2) (2) <3> (3)
c p. (2)
lg (2) (3) (4) (3) © 8* (3)
19 • (3) 6 (4) (2) o (4) 20 (4) 6 (4) (4) S25 (4) 21 5 6 6 7 6 22 (4) 7 6 6 6
23 (4) 6 (4) 6 5 24 6 8 (3) (3) 5
25 6 6 6 g 6 26 6 '7 5 (4) 5 27 (4) 8 5 (2) i 5 28 (4) g (3) (2) (4)
29 (4) 5 (U) 7 5 30 (4) b 5 (4) 5 31 (4) 6 (4) (2) (4)
( ) s disturbed dayso
(l>?)
Table 6
North Atlantic Badio Propagation Quality yigurea
Top Fixture 0100-1200 OCT Bottom Fl/gure 1300-2*400 OCT
Day Oct. 19**3
Not. 1943
Dec. l?4j
Jan. 19^4
F eb. 1944
"ar. 19UU
Apr. May June July 1944
Aug- 1944
Sept. 1944
Oct. 1944
Nor. 1944
Dec. 19'44
Jea. 1945
Feb. 1945
1 (2) (3) (4) (4) 5 b (4) (4) 6 7 7 5 b b 7 3 5 (2) (4) 5 (4) 6 7 6 (4) 6 7 7 6 6 7 7 3 6
2 (2) (4) 5 5 5 6 (3) 13) 5 6 6 14) 6 7 6 5 5 (2) 5 5 6 6 6 (4) 14) 7 6 6 5 7 7 6 5 6
5 (2) 5 (4) 5 5 5 14) (4) 6 7 (2) 3 5 6 5 5 6 (4) 5 (4) 6 7 7- 6 3 7 6 (3) 6 6 7 6 3 7
4 (3) 5 (3) 6 3 5 (3) 3 7 7 3 6 6 6 6 3 6 5 7 (3) 6 6 3 14) 3 7 7 6 7 7 7 7 14) 7
5 (4) 5 (4) (4) 6 5 13) (4) 7 7 6 3 6 6 6 5 6 5 7 (4) 6 6 (4) (4) 7 7 6 7 7 6 6 6 7
6 (4) (4) 5 6 6 (4) (3) (4) 7 7 6 7 6 (4) 3 3 5 6 5 6 6 7 5 14) 5 7 7 6 7 7 6 6 6 6
7 5 (4) 6 6 5 (3) (4) 14) 7 7 6 6 6 6 6 6 5 6 6 6 6 (4) 5 14) 5 7 7 6 7 7 6 7 7 7
8 (4) (4) 5 5 (3) (3) (3) (4) 7 7 7 6 6 5 6 6 3 6 5 6 6 5 5 14) 6 7 7 7 6 7 6 7 6 6
9 (3) 5 6 6 (4) 13) (4) 6 7 3 7 6 6 6 7 3 5 (4) 8 6 7 (4) 14) 6 7 7 6 7 7 7 7 7 6 6
10 (3) 6 6 6 (4) (3) (3) 6 7 6 6 6 3 6 7 14) 5 R 6 6 6 3 (4) (4) 7 7 6 7 7 7 7 7 (4) 6
11 (4) 6 6 (4) (4) (3) 13) 6 7 6 6 6 14) 6 7 3 5 6 6 7 (4) 3 3 3 7 7 6 7 7 6 6 7 3 6
12 5 5 6 (3) (4) (4) (4) 6 7 7 3 3 3 6 7 6 6 6 7 6 3 3 3 6 7 7 7 6 7 7 7 7 6 7
13 5 6 6 (3) 3 $3> 5 6 7 7 6 6 6 6 6 3 6 7 7 7 5 6 (4) 7 7 7 7 6 7 7 7 6 7 7
14 6 7 7 14) <3> (4) 6 7 6 7 7 6 3 6 14) 6 6 7 7 7 (4) 14) 5 7 7 6 7 7 7 3 7 3 6 8
15 5 7 6 (3) 14) (4) 6 6 3 6 6 6 (3) 6 3 5 5 7 7 6 5 (4) 6 6 7 3 6 7 7 5 7 6 (4) 6
16 7 6 3 <4) 14) 14) (4) 7 6 6 6 6 14) 7 5 13) 14) 7 7 (4) (4) 5 6 (4) 7 6 6 7 7 6 7 (4) 3 6
17 6 7 (3) (3) 14) 5 14) 7 6 6 7 6 (4) 7 (3) 14) (4) 7 8 (4) 14) 6 6 6 7 7 6 7 7 6 7 13) (3) 6
18 6 6 (4) (3) 5 6 6 6 6 7 3 6 3 6 13) 5 6 7 6 (4) (4) 6 6 7 7 7 7 6 7 6 6 (4) 6 6
19 6 5 (3) (4) 5 (4) 6 6 6 7 (4) 6 3 6 (4) 3 6 7 (4) 14) 3 6 3 7 7 7 6 6 7 7 7 3 3 7
20 6 (4) (3) (4) 3 (4) 6 7 7 7 3 3 6 3 3 3 6 7 (4) (3) 3 6 6 7 7 7 6 6 7 7 3 6 3 7
21 5 (3) (4) (4) (4) 5 6 7 6 6 3 3 6 5 3 6 6 7 (3) (4) 5 3 7 7 7 7 6 7 6 7 6 6 6 7
22 5 (3) (4) 3 3 14) 6 7 5 6 6 3 6 6 6 6 6 6 (3) 5 5 6 6 7 7 6 6 7 6 7 6 6 6 7
23 (4) (3) (4) 5 14) 5 6 6 3 6 3 3 6 6 6 6 6 6 (3) (4) 6 6 7 7 7 5 6 6 6 7 7 7 7 7
24 (4) (2) 5 5 5 3 6 6 6 7 3 3 6 6 7 6 6 (4) (3) 5 5 6 7 7 6 6 7 6 3 6 7 7 6 7
26 (3) (3) 5 (4) 6 6 3 5 6 7 6 5 3 7 7 6 6 (4) (3) 5 3 f 7 7 7 7 7 7 6 7 7 7 7 7
26 (2) (2) (4) 5 3 14) 3 7 6 7 6 6 3 6 7 6 5 (3) (3) (4) 6 7 6 7 6 6 7 7 7 6 7 7 7 7
27 (3) (2) 6 5 6 (3) 3 6 3 7 6 5 6 7 3 6 5 (4) (2) 6 5 7 (3) 6 6 6 7 7 6 7 7 <3> 7 6
28 (2) 0) 5 5 5 (4) 5 7 6 7 3 6 6 7 14) 7 (4) (2) (3) 6 5 7 5 6 7 6 7 6 7 7 7 3 7 6
29 (2) (3) 5 5 6 <3> 5 5 6 7 3 6 6 7 5 (3) (2) (3) 5 6 7 (4) 6 5 6 7 7 7 7 7 5 (3)
30 (3) (4) 6 5 (4) 14) (4) 6 6 5 6 6 7 5 (3) (3) (4) 6 6 (4) 6 3 6 7 7 6 7 7 5 (4)
31 (3) 5 5 (4) 6 6 5 6 5 (4) (4) 6 _ 6 6 7 6 7 6 5
( ) a disturbed day*
Table 7
Morth Pacific Radio Propagation Quality Figures
Top figure 0100-1200 OCT Bottom Figure 1300-2400 OCT
Da/ Oct.
1943
Mot. 1943
Dec. 1943
Jaa. 1P44
*eb. 1?44
Mar.
1944
A or. 1944
Ma/ 1944
June
-1344 July 1944
Aug. 1944
Sept.
1944-
Oct. 1944
Hot. 1944
Dec. 1944
1 tjr 5 5 (4) (45 £ b 5 7 7 7 6 5 6 5 (4) 5 5 (4) (4) 8 5 5 7 7 8 6 6 6 6
2 (3) 5 5 5 5 7 5 5 7 8 7 5 6 6 6 (4) 6 5 5 5 8 5 6 6 7 6 5 7 6 7
3 (3) 6 5 6 (4) 7 (3) 5 7 8 5 7 (4) 6 6
5 5 6 5 (4) 7 (3) 5 7 8 5 6 5 5 6 4 (3) 5 (4) 6 6 5 (4) (4) g g 7 7 5 6
6 5 5 5 6 6 (4) 5 7 8 7 6 6 7 6 5 5 7 5 5 6 5 (4) 6 7 8 6 7 7 5 6
6 7 5 (4) 6 6 5 5 8 g 7 7 7 7 6 6 6 (4) (4) 5 6 (4) (4) 5 ' 7 7 7 7 7 6 6
5 (3) 5 6 5 5 5 7 7 7 7 7 6 6 7 5 6 5 6 5 (4) (4) 5 8 7 7 7 7 6 6
i (4) 6 7 5 (4) (4) 5 7 8 g 7 6 6 6 s 5 6 6 6 (4) (4) (3) 7 8 7 7 7 7 (4) 6
6 7 6 7 (4) 5 (4) 7 7 7 6 6 6 6 7 9 5 6 7 5 (4) (4) 5 7 7 7 6 8 7 5 6
6 6 6 (4) 6 5 (3) 7 7 S 6 7 7 5 7 10 5 5 6 £ 5 5 6 7 7 7 7 7 b 5 5
5 5 6 5 7 5 5 , 7 7 7 7 7 7 (4) 7 li 6 5 6 5 5 (4) (4) 7 7 7 7 6 5 5 5
7 6 7 (4) 7 (4) 5 7 6 8 7 7 7 6 6
12 6 6 6 5 (4) (4) 6 7 S 7 7 7 7 5 5 6 6 6 5 (4) 5 6 7 7 7 6 7 7 6 7
13 5 7 6 (4) 5 5 7 8 8 8 7 6 5 5 6 6 7 7 (4) 5 5 6 8 7 7 7 7 7 6 6
14 t 6 6 (4) 5 (4) 7 g 7 g g 6 5 5 7 7 5 7 (3) 5v 5 7 8 7 g 7 7 6 5 6
15 ( 6 7 (4) (3) 5 7 7 7 7 8 7 (4) 5 5 6 * 7 (4) 5 5 7 8 7 7 7 7 6 7 (4)
1( 6 5 (4) 5 (4) 6 5 7 6 7 8 7 7 5 (4) 1 6 ..5 (4) (4) 6 g £ 5 7 7 7 6 (3)
17 6 6 5 (4) 5 6 5 7 7 7 7 7 (4) 6 (3)
7 6 5 (4) 5 6 7 7 7 7 7 6 6 (2) 18 6 5 5 (4) 5 6 5 g 7 7 7 7 5v 6 f3>
7 7 6 (4) 5 5 6 8 6 7 6 7 (4) 5 <3> 19 7 5 (4) 5 7 (4) 7 7 7 7 7 7 (4) 6 (3)
7 t 7 (4) 5 (4) 6 8 8 7 7 7 6 7 (4) 20 7 5 5 5 5 5 7 7 7 7 7 6 5 5 (4)
7 6 5 (4) (4) 6 7 8 7 7 7 7 6 6 (4) 21 8 (4) (3) 5 5 6 7 S 8 7 6 7 7 5 5
7 5 5 6 5 6 7 8 7 6 6 7 6 6 6 22 7 (4) . 5 (4) 5 6 7 8 6 7 6 7 1 5 5
7 (3) 5 (4) 5 6 7 7 7 5 6 7 7 6 6
23 5 5 6 5 5 6 7 8 6 6 7 7 5 6 5
6 (4) 5 5 5 6 7 7 7 7 7 6 7 5 5 24 (4) (4) 7 5 6 5 7 6 6 T 1 • 7 6 7 5
(4) 5 6 5 7 5 7 7 6 8 6 7 7 7 5
25 5 (4) 7 5 5 6 7 7 7 7 7 6 6 7 5
5 5 6 5 6 6 7 7 7 1 7 7 7 7 6 6
26 5 (J> 5 5 6 5 7 8 7 7 7 0 & ( 6
( (4) (4) 5 7 5 6 6 7 g 7 7 6 5 5
27 (4) (4) 5 5 6 (3) 7 7 5 7 7 6 6 & 6 ( (3) 6 6 5 5 7 6 7 7 7 6 7 A
28 (4) U 5 5 7 (3) 7 7 6 7 6 7 & 5 (4)
5 <3> » 6 7 (4) 8 6 6 7 6 6 5 7 (4)
29 (4) (4) 5 5 7 (4) 8 7 6 7 7 7 5 5 (4)
5 (4) 5 £ 8 5 7 7 6 7 7 7 5 6 5 30 (4) 5 14) ' 5 5 6 6 6 7 7 6 5 (4)
5 (4) 6 (4) 6 b 5 6 7 7 0 6 6 5 31 (4) (4) (4) 5 5 8 7 • (4)
(4) (4) L. 6 6 Z L 6 (4)
Table 8
Geomagnetically Disturbed Days* Based on
Day Oct. Nov. Dec. Jan. 7eb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Dec. Jan. Feb. 1943 1943 1943 1944 1944 1944 1944 1944 1944 1944 1944 1944 1944 1944 1944 1945 1945
1 D D D D D 2 D D D D D D D 3 D D D D D 4 D D D D D t
5 D D D D D D
6 . D D D D %
7 D D D D D D 8 D D D D D
9 D D D D 10 D D D D D
11 D D D D
12 D D D
13 D D D
14 D D D
15 D D D D D D
16 D B D D D D
17 D D D D D
18 D D D D
19 D D D 20 D D D D
21 D D D S
22 D D D D D
23 D D 24 D D D D D D
25 D D D
26 D D D D D D
27 D D D D D
26 D D D D
29 D D D D D
30' D D D D D
31 D D
• I'
Table 9
Radio Disturbance Based on North Atlantic Quality Figure* (Disturbed If Half or Whole Day^ 4)"
26-Day Recurrence Table
2t m m zt .rt zt 23-
3 zt zt 2t in
m 2* zt zt 2* 23- CP zt 2t 23' tn CTn cn C'' cn zt 3- o> 0 zr CTN cr> 2t O' T~\ <n CTv in
fi cr> rH rH rH rH CTv CJN rH rH CP rH rH O'' pH rH rH fH rH rH rH i*H rH rH o> rH
n. 0 0 CT> cs. a <*. cr. 0 ov » » O » 1— cm «c * rH VO 0- P*— m a- m CM in VD pH Q»
rH CM CM fH rH 60 in m CM CM rH rH BO CM |H rH VO CM 0 0
o o o 0 0 0 0 0 O © £
O •*> *4“* 0 O • O
+» > 0 c (h 1- 13 f>0 P, P* z> > O s r^J
a _j
0 0
0 0
0 25
v p
od *-s
© £4 j £ J *-3 *Tt
© CO
© to
0 O
O ;z <5
« <» {*1
1 D D D D D D t) D
2 D D D D D D D D D ♦
3 D D D D D D D D D
u D D D D D 0 D D D
5 D D D D D D D D D D
6 D D D D D D D D D
7 D D D D D D D D
8 D D D D D D I)
9 D D D D D D D D
10 D D D D D D
11 D D D D D D
12 D D D D D D D D
13 D D D D D D D D
lb D D
15 D D
16 D D
17 D D
18 D D D
19 D D D
20 D D
21 D
22 D D
23 D D D
2b D D D
25 D D D D D D
26_ D D D D D D D D
(63 out of lUl do not recur)
Had lo Disturbance Baaed on North Atlantic Quality Tigureg (Disturbed if Half or Whole Day4» 4)~
27-Day Recurrence Table
D
(56 out of lUl do not recur)
r«b
e 2
5»
19^5
Table 11
$
Table 12
Radio Disturbance Baaed on North Atlantic Quality Figures (Disturbed if Half or Whole Day^ 4)
i**\ l*"\ 1*0 at 5 at at at at at at CTv tri O'. co co CO co
t-O rH rH rH rH *—$ rH rH o> r-4 rH
*, o oc r— ir* K\ rH a
rH cv cu cu cu CU cu O CU
c o o 0 o o o 0 >* > V c jO H tr >>
o o o a 4) « P- ft O o w ft 5E ■=•?
1 D D D D D
2 D D D
?3 D D D U D D D D
5 D D
6 D D D D
7 D D
8 D D D D
9 D D D
10 D D D D D
n D D D D
12 D D
13 D D D
lU D D D
15 D D D D
16 D D D D D
IT D D D D D
18 D D D D D
19 D D D D D
20 D D D D
21 D D D D D D
22 D D D D D
23 D D D D D D
24 D D D D D
25 D D D D D
26 D D D D D
27 D D D
28 D D D 29 D D D D
3 at at
^r CTn at at at uo LO CT. CTn (T* rH CO CO at ^t rH rH rH rH rH CO a
t> rH i—1 rH a. » a »
55 r— LTn rH CM o » > o rH rH rH CO r— lO
<s> d
c
Sp
C 0 > 6 c
o
pJ a> o O a cC ^3 <5 CO o as ft *-3
D D D D
D D
D D D D D D D
D D
D
D D
D
D D D D
D D
D
(64 out of lUl do not recur)
Comparison of North Atlantic Sadlo Propagation
Quality n^sa At&JBPk Warala&a
H if hits half day or whole M if missfes half day or whole
(S) period following warning not better than fair S period following warning "better than fair
1ST Feb. 1944
liar. 1944
Apr. 1944
May- 1944
June 1944
July 1944
Aug. JL£L44
Sept. 1944
Oct. 1944
Hov. 19.44
Dec. 1944
Jan. 1945
Feb.
19.46... ...
i H H 3 S (S) S S (S)
2 H H (3) s M s S 2 (s) H H M (s) (s) S
4 H (S) (S) S S
5 (S) H H S S s (s) 8
6 H H H S H (S)
7 H H H H 3 S
e H H H H (S)
9 H H H S
10 H E H S (3) H
11 E H H s s s M a (3) 12 H H H (3) (S) (3) S
13 (S) H (S) 3 s s S s
14 E E s E
15 E H s H (3) E
16 E M M s s H H H H
17 H (3) M § s H 1 E H
18 (6) S s H (S)
19 M H s s H
20 H a (S) (8)
21 M s (S) S (S)
22 M s (s) .8
23 M 8 (s) (S) (3) s
24 (S) (3) S s (3) (8) 3 S
25 S (S) s S (sj (3)
26 M (S) S 3 s
27 M S (S) s H (s)
28 H (S) s (3) H H
29 M (3) (3) (S) H
30 H E H (S) 3 (3) E
31 H S (s) <3) H Total
Period H 10 14 13 8 0 0 1 0 3 1 7 7 3 67
M 2 6 2 0 0 0 1 1 1 0 © 0 0 13
0 14 5 5 15 21 27 15 14 16 19 16 18 19 203
s 3 6 10 8 9 4 14 15 11 10 9 6 6 111
Day
T~ 2 3 4 5 6 7
8 S
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Table 14
Comparison of North Atlantic Radio Propagation Quality Figures (Local Night) (0100-1200 GCT)
With IBPL Warnings
(x = Warning Given)
Feb. 1944
Mar. 1944
Apr. 1944
May 1944
June 1944
Jhly 1944
Aug. 1944
Se£t. 1944
Oct. 1944
Nov. 1944
Dec. 1944
Jan. 1944
Feb. 1944
5 6 (4)x (4)x 6 x 7 x ? 5 x 6 x 6 x 6 5 x 5
5 6 (3)x (3)x 5 x 6 x 6 (4) 6 x 7 6 5 5
5 5 x (4)x (4)x 6 7 (2) 5 x 5 6 5 x 5 6 x
5 5 (3)x 5 x 7 7 5 x 6 6 6 6 2 5 6
6 5 x (3)x (4)x 7 x 7 6 x 5 6 6 x 6 5 x 6 x
6 (4)x (3)x (4)x 7 x 7 6 7 6 (4)x 5 5 5 x
5 x (3)* (4}x (4) x 7 7 6 6 6 x 6 x 6 6 5
(3)x (3)x (3)x (4)x 7 7 7 6 6 5 x 6 6 5?
(4)x (3)x (4)x 6 x 7 5 7 6 6 6 7 5 5
(4)x (3)x (3)x 6 7 6 6 x 6 5 6 7 (4)x 5
(4)x (3)x (3)x 6 7 6 x 6 x 6 x (4) 6 ? X 5 x 5
(4)x (4)x (4)x 6 7 7 5 x 5 x 5 x 6 7 6 6 *
5 x (3)x 5 x 6 x 7 7 x 6 6 x 6 x 6 6 x 5 6
(3)x (4)x 6 7 6 7 7 6 x 5 6 (4)x 6 6
(4)x (4)x 6 6 5 6 6 6 x (3)x 6 5 x. 5 5
(4)x (4) (4) 7 6 6 6 x 6 x (4>x 7 5 (3)x (4)x
(4)x 5 x (4) 7 6x 6 7 6 x (4)2 7 (3)x (4)r (4>X
5 x 6 x 6 6 6 7 5 6 5 6 x (3)x 5 x 6
5 (4) 6 6 6 7 (4)x 6 x 5 6 x <4)x 5 6
5 (4)x 6 x 7 7 7 5 5 6 5 5 x 5 6
(4) 5 6 x 7 6 6 5 2 5 6 x 5 x 5 6 6
5 (4) 6 x 7 5 6 6 5 x 6 6 6 6 x 6
(4) 5 6 x 6 5 x 6 5 x 5 x 6 x 6 6 6 6
5 x 5 x 6 x 6 6 x 7 5 x 5 x 6 x 6 7 6 x 6
6 6 x 5 5 5 6 x 7 6 x 5 x 5 x 7 7 6 6
5 (4) 5 x 7 x 6 x 7 6 6 5 6 7 x 6 5 6 (3) 5 6 x 5 7 6 5 6 7 x 5 6 5 x
5 (4)* 5 x 7 x 6 7 5 x 6 x 6 7 (4)jc 7 (4)x
6 (3) 5 x 5 x 6 7 5 x 6 6 7 5 (3)x
(4)x (4)z (4)x 6 6 5 x 6 6 x 7 5 x (3)x
L4lx 6 x 6 5 x 6 5 x
»y"
Table X5
Cogmarl8on of North Atlantic Radio Propagation
Quality Figures (Local Dar) (1300 - 2400 GOT) With IBPL Warnings
(x - Warning Given)
Day Febo Mar0 Apr, May June July Aug„ Sept. Oct Hov„ Dec > e Jan. Febo • 1944 1944 1944 1944 1944 1944 1944 1944 1944 1944 1944 1945 1945
1 6 7 6 x (4)x 6 X 7 x 7 6 X 6 X 7 X 7 5 x 6 2 6 6 (4)x (4)x 7 X 6 x 6 5 7 X 7 t 6 5 6 X 3 7 7 x 6 x 5 x 7 6 (3) 6 X 6 7 6 X 5 7 X 4 6 5 (4)x 5 x 7 7 6 x 7 7 7 X 7 X 5 7 5 6 6 x (4)x (4)x 7 X 7 6 x 7 7 6 X 6 6 x 7 X 6 7 5 x (4)x 5 x 7 X 7 6 7 7 6 X 6 6 6 X 7 (4)x 5 x (4>x 5 x 7 7 5 7 7 X 6 X 7 7 7 8 5 x 5 x (4)x 6 x 7 7 7 6 7 6 X 7 6 6 9 (4)x (4)x 6 x 7 x 7 6 7 7 7 7 7 6 6
10 5 x (4)x (4)x 7 7 6 7 2 7 ? X 7 7 (4)x 6 11 5 x 5 x 5 x 7 7 6 x 7 x 7 X 6 6 7 X 5 x 6 12 S x 5 x 6 x 7 7 7 6 x 7 X 7 X 7 7 6 7 X 13 6 x (4)x 7 x 7 2 7 7 x 6 7 X 7 2 7 6 X 7 7 14 (4)x 5 x 7 7 6 7 7 7 X 5 7 5 X 6 8 15 (4)x 6 x 6 7 5 6 7 ? X 5 X 7 6 X (4)x 6 16 5 x 6 (4) 7 6 6 7 x 7 X 6 X 7 (4) X 5 x 6 X 17 6 x 6 x 6 7 7 X 6 7 ? X 6 X 7 (3) X (4)x 6 X 16 6 x 6 x 7 7 7 7 6 7 6 6 X (4) X 6 x 6 19 6 5 7 7 7 6 6 x 7 X 7 7 X 5 X 5 7
20 6 $ X 7 X 7 7 6 6 7 7 5 X 5 X 5 7
21 5 7 7 x 7 7 6 7 x 6 7 X 6 X 6 6 7
22 6 6 ? X 7 6 6 7 6 X 7 6 6 6 x 7
23 ' 6 7 7 x 7 5 X 6 6 x 6 X l X 6 6 7 7
24 6 x 7 x 7 x 6 6 X 7 6 x 5 X 6 X 7 7 7 x 7
25 7 ? X 7 x 7 7 X 7 7 x 6 X 7 X 7 7 7 7
26 7 6 7 x 6 x 6 X 7 7 7 6 7 7 X 7 7
27 7 (3) 6 6 x 6 7 7 6 rr 7 X (3) X 7 7
28 7 5 x 6 x ? X 6 7 6 x 7 X ? 7 5 X 7 6 X
29 7 (4) 6 x 5 x 6 7 7 x r'j ( 7 7 5 (3)x
30 (4)x 6 x 5 x 6 7 7 x 6 7 X 7 5 X (4)x
lLx JL ? JL, - 5- X-
<•>
Day
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
H M
0 8
Comparison of North Atlantic Badio Propagation Quality Figures With ISIB Warnings
H if hits half day or whole M if misses half day or whole
(S) period follovring warning not better than fair S period following warning better than fair.
Febo Mar„ Apr„ May June July Aug„ Sept* 0cto Ifov. Dec* Jan. Feb0 .1944 . 19-44. 19.44 19.44 J.,9.44 ..1944....AS44 L9M X9.44-1&44 -1944.1945 ... 1245,
M (S) H
H (S) H (S) H
M H M HE M HE M EH H HE E H H H M H
(S) H E' M H H H H H H H
E E H
(S) E H H M
H
M
H E
(S) M
(S) s
s
M
H
M (S) (S)
H H M
M
H (S) s
(S) M
M E M H M H (S) H
(S) (S)
(3) (3)
K E H (S) H (S) H H H H
H E
H H M
8 14 4 6
15 8 2 3
14 7 1 1
13 22 2 1
0 0 0 0 0 0 2 1
28 31 28 29 2 0 1 0
2 16 2 0*1
25 28 22 2 12
3 5
18 5
3
M H
(S) H
,r;
*.-k-
K
Total Period
2 67 1 24
23 290 2 23
Table 17
Comparison of North Atlantic Badio Propagation Quality Figures (Local Night)(0100-1200 GCT)
With I SIB Warnings
(x - Warning Given)
Febo 1944
Mar 0 1944
Apr. 19.44
May 1944
June 1944
July 1944
Aug, 1944
Sept 1944
Oct 0 1944
Nov. 1944.
Dec„ 1944
Jan, 1945
Feb.
194& 5 6 (4) (4)x 6 7 7 5 6 2 6 6 5 5 5 x 6 (3) (3)x 5 6 6 (4) 6 7 6 5 5
'5 5 (4)x (4)a: 6 7 (2) 5 5 6 5 5 6 5 5 (3)x 5 x 7 7 5 6 6 6 6 5 6 6 5 x (3)x (4)x 7 7 6 5 6 S 6 5 6 6 (4) (3)x (4)x 7 7 6 7 6 (4)x 5 5 5 5 (3)x (4)x (4)x 7 7 6 6 6 6 • 6 6 5
(3) (3)x (3)x (4) 7 7 7 6 6 5 6 6 5 (4) (3)x (4)x 6 7 5 7 6 6 6 7 5 5 (4)x (3)x (3)x 6 7 6 6 6 5 6 7 (4) 5 (4)x (3)x (3)x 6 7 6 6 6 (4) 8 7 5 x 5 (4)x (4) (4)x 6 7 7 5 x 5 5 x 6 7 6 x 6 x
5 x (3) 5 6 7 7 6 6 6 6 6 5 x 6 (3)x (4) 6 7 6 7 7 6 5 6 (4) 6 6 (4)x (4)x 6 6 5 6 6 6 (3)x 6 5 5 5 (4)x (4)x (4) ? 6 6 6 6 (4)x 7 5 (3) (4) (4)x 5 (4)x 7 6 6 7 6 (4) 7 (3)x (4) (4)x
5 6 6 6 6 7 5 6 5 6 (3)x 5 x 6 5 (4)x 6 6 6 n
t (4) 6 5 6 (4)x 5 6 5 (4)x 6 7 7 7 5 5 6 5 5 x 5 x 6
(4)x 5 x 6 7 6 6 5 5 6 5 x 5 x 6 6
5 (4) 5 7 5 6 6 5 6 6 6 6 6
(4) 5 6 6 5 x 6 5 5 6 6 6 6 6
5 5 6 6 6 x 7 5 5 6 6 7 6 6 6 6 5 5 6 7 6 5 5 7 7 6 6 5 (4) 5 7 6 7 6 6 5 6 7 6 5
6 (3)x 5 6 5 * 7 6 5 6 7 5 6 5 x 5 (4)x 5 x 7 6 7 5 6 6 7 (4)x 7 (4)x
6 (3)x 5 x 5 5 7 5 6 6 7 5 (3)x
(4)x (4)x (4)x 6 6 5 6 6 7 5 (3)x
—U-)x- 6 6 5 <2 5 111-
<r
Table 18
Gomnarlaon of North Atlantic Radio Propagation Quality,Figures (Local Say) (1300-2400 G-CT)
With ISXB Warnings.
(x = Warning Given)
Day Feb. 1.944
Mar. 1944
Apr. 1944
May 1944
June 1944
July 1944
Aug. 1944
Sept. 1944
Oct. 1944
Nov. 1944
Dec.
1544..
Jan. 1945
Feb.
194$
1 6 7 6 (4)x 6 7 7 6 6 x 7 7 5 6 •2 6 x 6 (4}x (4)x 7 6 6 5 7 7 6 5 6 3 7 7 6 x 5 x 7 6 (3) 6 6 7 6 5 7 4 6 5 x (4)x 5 x 7 7 6 7 7 7 7 (4) 7 5 6 6 (4)x (4)x 7 7 6 7 7 6 6 6 7 6 7 5 (4)x 5 x 7 7 6 7 7 6 x 6 6 6 7 (4) 5 x (4)x 5 x 7 7 6 7 7 6 7 7 7 8 5 5 x <4>x 6 7 7 7 6 7 6 7 6 6 9 (4) (4)x 6 x 7 7 6 7 7 7 7 7 6 6
10 5 x (4)* (4)x 7 7 6 7 7 11 7 7 7 (4)x 6 11 5 x 5 x 5 x 7 7 6 7 7 6 6 7 5 2 6 12 5 x 5 6 x 7 7 7 6 x 7 7 x 7 7 6 x 7 x 13 6 x (4) 7 7 7 7 6 7 7 7 6 7 7 14 (4)x 5 7 7 6 7 7 7 5 7 5 6 8 15 (4)x 6 x 6 7 5 6 7 7 5 x 7 6 (4) 6 16 5 x 6 x (4)x 7 6 6 7 7 6 x 7 (4)x 5 6 17 6 x 6 6 7 7 6 7 7 6 7 (3)x. (3) 6 x 18 6 6 7 7 7 7 6 7 6 6 (4)x 6 x 6
19 6 5 x 7 7 7 S 6 7 7 7 5 x 5 7
20 6 6 x 7 7 7 6 6 7 7 5 5 x 5 x 7
21 5 x 7 x • 7 7 7 6 7 6 7 6 x 6 6 7
22 6 6 7 7 6 6 7 6 7 6 6 6 7
23 6 7 7 7 5 x 6 6 6 7 6 6 7 7
24 6 7 7 6 6 x 7 6 5 6 7 7 6 7 25 7 7 7 7 7 7 7 6 7 7 7 7 7
26 7 6 7 6 6 7 7 7 6 7 7 7 7 27 7 (3)x 6 6 6 7 7 6 7 7 (3)x 7 6 x
28 7 5 x 6 x 7 6 7 6 7 7 7 5 x 7 6 x
29 7 (4)x 6 x 5 6 7 7 7 7 7 5 (3)x 30 (4)x 6 2 5 x 6 7 7 6 7 7 5 (4)x
6 x 6 6 7 6 5
*
Qggrgar^pn <?t Nor^h Padfito Jadlo_?rpP-a^aiioa Q,ual 1 ty flgurjng With IBPL Warning
H if hits half day or whole
M if misses half day or whole
(S) period following warning not "better than fair
S period following warning "better than fair
Day Feb, 1944
Mar„ 1944
Apr0 1944
May 1944
June 1944
July 1944
Aug. 1944
Septo 1944
Oct6 1944
Nov. 1944
Dec, 1944
•1 M (s) (3) 5 S S (S) 3
2 (S) (S) S s s 3 M 8 H (S) S M S 4 H H S 3 3
5 (s) E (s) s S (3)
6 E E (s) s S
7 (s) H H (S) S S
8 H H H s a
9 H H H 3
10 (S) (s) (s) s s M
11 (S) H H s s s (s)
12 H H 3 s s s 13 (S) (s) 3 s s 3 s s 14 (s) H s s 15 H (s; s H H
16 H s 3 s H
17 (S) s 8 s H H
18 (S) (S) M (s) E 19 M s s M s H
20 M (S) • S s E 21 s s S (S)
22 s s 23 s 3 3 s (S)
24 8 (S) s 8 s 3 s 25 s 8 S s s s 26 S s S (S)
27 M 3 3 (S)
28 H S S s s ' E 29 M s 8 s M 30 (S) s (s) 3 s H
31 3 (s) s H
Total Period
H 5 8 8 1 0 0 0 0 2 1 9 34
M 3 3 0 0 0 0 0 0 3 1 1 11
G 13 8 7 15 21 27 16 15 14 18 14 168
3 8 12 15 .JL5 2 _ A5 JL5 12 JLQ 7 122-
Table 20
.Comparison of North Pacific Badlo Propagation
Quality Figures (Local Day ) (0100-1200 GOT) With IBPL Warnings
(x = Warning Given)
Day Feb „ 1944
Mar„ 1944
Apr, 1944
May 1944
June 1944
July 1944
Aug, 15.44
Sept. 1944
Oct, 1944
Nov* 1944
Dec, 1944
1 (4) 6 6 x 5 x 7 x 7 x 7 6 X 5 x 6 x 5 2 5 7 5 x 5 x 7 x 8 x 7 5 6 x S 6 3 (4) 7 x (3)x 5 x 7 8 5 7 X (4) 6 6 x 4 6 5 <4)x (4)s 8 8 7 X 7 5 6 6 x 5 6 5 x (4)x 6 x 7 x 8 6 X 7 7 5 x 6 6 6 <4)x (4)x 5 x 7 x ? 7 7 7 6 x 6 7 5 x ( 4)x (4)x 5 x 8 7 7 7 7 x 5 x 6
a (4)x (4)x (3)x 7 x 8 7 7 7 7 (4)x 6 9 (4)x (4)x 5 x 7 x 7 7 6 8 7 5 6
10 5 x 5 x 6 x 7 7 7 7 X *7 r 6 x 5 5
11 5 x (4)x (4)x 7 7 7 x 7 X 6 X 5 5 6 x
12 (4)x (4)x 6 x 7 8 7 7 X 7 X 7 x 5 5
13 5 x 5 x 7 x 8 x 8 8 x ? 6 X 6 x 5 6 x
14 5 x (4)x 7 8 7 8 8 6 X 5 5 7 X
15 (3)x 5 x 7 7 ? 7 Q 7 X (4)x 5 5 x
16 ( 4 )x 6 b 7 6 7 8 X ry ( X 7 x 5 (4)x
17 5 x 6 x 5 7 7 x 7 *7 7 X (4)x 6 (3)x
18 5 x 6 x c; 4/ 8 7 7 7 r* ( 5 6 x (3)x
19 7 (4) 7 7 7 7 7 X 7 X (4) 6 x <3)x
20 5 • 5 x 7 x 7 7 7 7 6 5 5 (4)x
21 5 6 7 x 8 8 7 6 X 7 7 x 5 x 5
22 5 6 7 x 8 6 7 6 7 X 7 5 5
23 5 6 ? X 8 6 x 6 / X 7 X 5 x 6 5
24 6 x 5 x 7 x 6 6 x 7 6 X 7 X 6 x 7 5
25 5 6 x 7 x 7 7 x 7 7 X 6 X S x 7 5
26 6 5 7 x 8 x 7 x 7 7 6 6 6 6 x
27 6 (3) 7 7 x 5 7 7 o 6 6 x 6
28 7 (3)x 7 x 7 x 6 7 6 X 7 X 6 5 (4)z
29 7 (4) 8 x 7 x 6 7 7 X 7 5 5 (4)
30 5 x 6 x 6 x 6 7 7 X 6 6 x fv (4)x
2L_ 5 x 5 x 8 7 X 6 (4)x
Table 21
Coaparlaon of North Pacific Badlo Propagation
Figures, {lasA. #t,&*)JUL&Sl=24QQJ*^ With IBPL Warnings
(x - Warning Given)
Day Feb, Mar, Apr May June July Aug0 Sept. Oct, No-? 'o Dec „ 1944 1944 1944 1944 1944 1944 1944 1944 1944 1S44 1944
1 (4) 8 5 X 5 X 7 x 7 x 8 6 x 6 x 6 X 6 2 5 8 5 X 6 X 6 x 7 x 6 5 7 x 6 7 3 (4) 7 x (3)x 5 X 7 8 5 6 x 5 5 6 x 4 6 6 (4) X 5 X 7 8 7 X 6 6 7 X 6 x 5 6 6 x 5 X 5 X 8 x 8 7 X 7 7 7 X . 6 6 6 5 x 5 X 5 X 7 x 7 7 7 7 6 X 6 7 5 x (4)x (4) X 5 X ? 8 8 7 6 x 6 X 6 8 U)x 5 x (4) X 7 X 7 7 6 6 6 6 X 7
9 6 x 5 x (3)x 7 X 7 8 6 7 7 5 7
10 7 x 5 x 5 X 7 7 7 7 X 7 7 x (4) 7
11 7 x (4)x 5 X 7 6 8 x 7 X 7 x 7 6 6 x 12 (4)x 5 as 6 X 7 7 7 6 X 7 x 7 x 6 7
13 5 x 5 x 6 X 8 X 7 7 x 7 ? X 7 x 6 6 x 14 5 x 5 x 7 8 7 8 7 7 x 6 5 6 x 15 5 x 5 x 7 8 7 7 7 7 x 6 x 7 (4)x
16 (4)x 6 6 8 6 ' 5 7 X 7 x 7 2 6 (3)x (a)* 17 5 x 6 x 7 7 7 x 7 7 6 x 6 x 6
18 5 x 5 x 6 8 6 7 6 7 (4) 5 X (3)x
19 5 U) 6 8 8 7 7 X 7 x 6 7 X (4)x
20 (4) 6 x 7 X 8 7 7 7 7 6 6 X (4)x
21 5 S ? X 8 7 6 6 X 7 6 x 6 X 6
22 5 6 7 X 7 7 5 6 7 x 7 6 6
23 5 6 7 X 7 7 x ? 7 X 6 x 7 x 5 5
24 7 x 5 x 7 X 7 6 x 8 6 X 7 x 7 x 7 5
25 6 6 x 7 X 7 7 x 7 7 X 7 x 7 x 6 6
26 7 5 6 X 6 X 7 x 8 7 7 6 5 5 x 27 6 5 7 6 X 6 7 7 7 6 7 X 5 x
28 7 (4) x 8 X 6 X 6 7 6 X 6 x 5 7 (4)x
29 8 5 7 X 7 X 6 7 7 X 7 5 6 5
30 6 x 6 X 5 X 6 7 7 X 6 6 x 6 5 x
3L 6 x 6 X 7 7 X 6 to*
■ III
zmsLjz aad_ISIB. Dally Warnings Compared With
North Atlantic Badio Propagation Quality Figures.
jo Disturbed ~~ j> Good Day” ^~Fair Days jo of S Whole or H&Xf Correctly Forecast as Warnings Bfeys Correctly Forecast Stormy Followed by Forecast Fair Day
1944 im I SIB IBPL I SIB IBPL I SIB IBPL 1SIB* Feb. 83 67 82 88 31 15 100 100 Mar. 70 70 45 73 5^ 43 67 100 Apr. 87 93 S3 87 85 33 50 100 May 100 88 65 96 67 33 25 100 June So disturbed days 70 93 40 20 22 50 July Ho disturbed days 87 100 0 0 0 No warnings Aug. 50 0 52 97 82 9 64 100 Sept. 0 0 48 100 64 0 53 No warnings Oct0 76 50 53 93 38 12 27 50 Nov. 100 100 66 97 100 33 *30 100 Dec. 100 86 63 92 50 20 55 100 1945 Jan. 100 38 75 78 31 31 67 80 Feb0 100 67 76 92 18 9 33 50
Mean 79 60 S3 9L 51 —JL9 46 85
IBPL Dally Warning Compared With North Pacific Radio Propagation (Quality FigureSo
jo Disturbed j> "Good Days” ^~Fair Days ~ jo of' S Whole or Half Days Correctly Forecast
Correctly Forecast
Forecast as Stormy
Warnings Followed by
..lair Sav
t , - H. rvv • .
1944 Feb.- 62 62 54 88 •U; ■ Mar. 73 67 64 67
Apr0 100 47 50 20 C N , |
Mqy 100 50 86 53 r; U
June No disturbed days 70 0 0 ‘i.
July No disturbed days 87 0 0 Aug. No disturbed days 52 0 0 Sept„ No disturbed days 50 0 0 >>
Oct0 67 54 29 17 .
Nov. 50 64 13 33
DeOo 90 67 27 43 - '-v4 -v • ,
Mean 77 61 29 29
*The few S warnings given by the ISIB are* as indicated,, almost always on ♦
fair days.
/'/ 7*)
Table 23
Conparison of North Atlantic Radio Propagation C&xaiity Figures with IRPL A-Zone Forecast
H if hits half day or whole M if misses half day or whole
(S) period following warning not better than fair S period following warning better than fair0
ty Oct. Nov. 1943 1543
Dec . 1943
Jan. 1944
Feb. Mar, Apr. May June July Aug. 1544 1944 1944 1944 1944 1944 1944
Sept o 1944
Oct.
19.44
Nov. 1944
Dec„ Jan0 Feb. 1944 1945 1945
. H H K H (S) K H 3 S S
i H M (s) H H (3) s E s 8’
5 M (S) E H H S s M (8) l M s H (S) H (S) S M
) K s K H s H H S w
> H H (S) S H H H 3 M S
r H H E H H s 8
i h M H H E H (S) ) H H H E
) H H M H s M
L H s E H H M K s (8) (8) 2 S s H H H M s 8 (S) 8 3 s H 6 H S s (8) 4 S S H H H S S S M 5 s s H H M S s S M s M (S) 5 S s H H H M E s 8 M H M K
7 H H M M s S H H M M
B S s E H S s s (3) M
3 S M E E H s M s 8 M S
3 H H H H 3 (s) S (S) S
1 ’ H H H M S 8 2 S H E S (s) M S S .
3 H H E H s s 8 S
4 H E S (S) s s g (S) § 3 s '
5 K H s M s s s s 1 j S H H H (S) M (S) s s S (3) 7 H E S (s) H s (S> (S) 8 S M
3 H H <s) (3) E s s S M M
9 H H (S) (8) M (s) (8) (3) 8 s (3) M 3 B M s M M H s (S) 5 s (S) M
L H s H (S) M Sot. Far,
B 16 13 12 13 10 13 11 8 0 0 0 1 1 0 2 0 0 100
K 3 4 1 1 2 7 4 0 0 0 2 0 3 1 5 8 3 44
G 6 6 6 11 12 8 6 17 21 21 22 16 14 17 20 15 10 236 S 6 7 12 6 5 3 9 6 9 10 n t 13 13 12 4 8 7 137
, ■/¥*)
»■
NORTH ATLANTIC RADIO PROPAGATION QUALITY FIGURE
FIG-I. CORRELATION OF RADIO PROPAGATION AND GEOMAGNETIC
DISTURBANCE.
<
<
1
_ o o o o o o o CD in <j- rO CvJ —
hinow ONiyno savo aaaarusia jo 39viN30d3d hinow DNiyna savo Q3gyrusia 30 39viN3oy3d SHIVd OlJIOVd HldON SHIVd OI1NV11V HldON
OC
T
NO
V.
DE
C.
JAN
. F
EB
. M
AR
. A
PR
"/A
Y
JUN
E
JUL
Y
AU
G.
SE
PT
. O
CT
. N
OV
. D
EC
. JA
N.
FE
B.
19
43
1944
i94
5
FIG
. 2
. R
EL
AT
IVE
FR
EQ
UE
NC
Y
OF
OC
CU
RR
EN
CE
OF
RA
DIO
PR
OP
AG
AT
ION
DIS
TU
RB
AN
CE
.
FIG
3.
RE
CU
RR
EN
CE
TE
ND
EN
CIE
S
OF
NO
RT
H
AT
LA
NT
IC
RA
DiO
PR
OP
AG
AT
ION
DIS
TU
RB
AN
CE
S.
PERCENTAGE DEVIATION OF QUALITY FIGURE FROM MEAN FOR WHOLE PERIOD.
U IP*
6
5
4
3
6
5
4
3
7
6
5
4
3
5
4
3
.4. RELATION BETWEEN NORTH ATLANTIC RADIO PROPAGATION QUALITY FIGURES AND SOLAR ACTIVITY, BY SUPERPOSED EPOCH METHOD.
om
OCTOBER 1943 - MAY 1944
DAYS BEFORE DAYS AFTER
FIG.5. RELATION BETWEEN NORTH ATLANTIC RADIO PROPAGATION QUALITY FIGURES AND
SOLAR ACTIVITY, BY SUPERPOSED EPOCH METHOD.
OCTOBER 1944-MARCH 1945
FIG.6.
z o h- < o < CL
o ui r* oc £X £ Ql 3 O
O o 2^o Q O < v cu CL >" —
V- i 2Iio i- < o Z =3 O
3 ° ~ »- «a
x h- IX o z
IRFL A-ZONE FORECAST
_l_2_3_4 5 6 7 8
i 16 26 22
1 12 58 65^,
5 9 51 30 1
2 ^ 15 29 26 4
10 16 12 6 3
! 5 2 2
z o s~ <£
<z CL O. UJ H CC X o CL 3 CS
o°° o Q <E C£ > i
0-0 ~ JO H* < ro Z X — < o _! }— «s
X >— X o z
4
V 2
2 9 60 81
1 15 4?L -^2 40 1
I -iS* 24 17 7
■n 9 II 19 10 1
' 4 7 3 2 2
3 2
CORRELATION OF NORTH ATLANTIC RADIO PROPAGATION
DISTURBANCE AND IRPL A"ZONE FORECASTS.
NO
RT
H
PA
CIF
IC R
AD
IO
NO
RT
H
PA
CIF
IC R
AD
IO
PR
OP
AG
AT
ION
QU
AL
ITY
FIG
UR
E
PR
OP
AG
AT
ION
QU
AL
ITY
FIG
UR
E
IRPL A-ZONE FORECAST
<3-
cvi i .
o o rO
i
■ 2
1 | I 1 2 j 13 | 9 i
1 | . |
r ■ 2 12 51 i 52 33 JL> —
J 6 IS
111'
a—hTs Cs
1 - i | i
3! 23 | 12 1 1 1 I
i 3 13 18 | 7 3 j
6 s i ; i
~t~ i I _J_!_ i
FIG. 7. CORRELATION OF NORTH PACIFIC RADIO PROPAGATION
DISTURBANCE AND IRPL A-ZONE FORECASTS.
*>