ionospheric data - nvlpubs.nist.gov · these data, observed at washington, d*c*, follow the soaling...
TRANSCRIPT
IRPL-F4
4-V
IONOSPHERIC DATA
ISSUED
DECEMBER, 19 44
PREPARED BY INTERSERVICE RADIO PROPAGATION LABORATORY National Bureau of Standards
Washington, D.C.
£.
'7 his document contains information affecting the national defense
of the United States within the meaning of the Espionage Act,50 U.S.C.,
31 and 32. Its transmission or the revelation of its contents in any man
ner to an unauthorized person is prohibited by law.”
IRPL-F4 INTERSERVICE RADIO PROPAGATION LABORATORY National Bureau of Standards
Washington, D.C.
Issued 25 Dec. 1944
Organized under Joint U.S. Communications Board
IONOSPHERIC DATA
Note*- This IRPL-F series report, issued monthly, serves as one of two current supplements to IRPL Radio Propagation Handbook, Part 1, (War Dept. TMll-499, Navy Dept. DNC-13-1). The supplements of the IRPIr-D aeries, "Basic Radio Propagation Predictions Three Months in Advance," issued earlier in the month, in¬ clude basic prediction charts, auxiliary charts and nomograms, as well as examples illustrative of their use.
CONTENTS
TERMINOLOGY.Page MONTHLY AVERAGES AND MEDIAN VALUES OF IONOSPHERIC DATA .... Page
Monthly averages of critical frequencies, virtual heights and F2-layer maximum usable frequency factorsj median values of highest frequency of Es reflections, and (graphical presentation only) percentage of total time of occurrence of Es above 3, 5, and 7 Me.
Provisional data (received by telephone or telegraph)
November, 1944 Baffin I., Canada.Table Fairbanks, Alaska . Table Reykjavik, Iceland. Table Churchill, Canada ••••... . • • Table Burghead, Scotland .. Table Delhi, India. Table Maui, Hawaii ...«•• Table Trinidad, Brit. West Indies.•••• Table Huancayo, Peru ..•••.••••• Table Brisbane, Q., Australia. Table Simonstown, Union of S. Africa.. Table Mt. Stromlo, N.S.W., Australia ....• . Table Christchurch, N.Z..••••••••... Table
3 4
1 2 3 4 5 6 7 8 9
10
11 12 13
2
Final Data
November, 1944 Ottawa, Canada . ••»••••• Table 14
Figs* 1 and 2 Washington, D.C• •••••••••••...••••• Table 15
Figs. 3 and 4 San Francisco, California . ••••• Table 16
Figs. 5 and 6 Baton Rouge, Louisiana .Table 17
Figs. 7 and 8 San Juan, Puerto Rico ••••.Table 18
October, 1944 * Trinidad, Brit. West Indies ••••.. • Table 19
Figs. 9 and 10 Brisbane, Q., Australia • . ....... Table 20
Figs .11 and 12 Mt. Stromlo, N.S.W., Australia • Table 21
Fig®*13 and 14 Christchurch, N.Z* • Table 22
Pigs,16 and 16
September, 1944 Madras, India ••••. Table 23
Fig. 17
August, 1944 Madras, India .. Table 24
Fig. 18
July, 1944 Madras, India •••••••••••••••••••• Table 25
Fig. 19
lONOSHiBRIC DATA FOR EVERY DAY AND HOUR. Page 6
November, 1944 Washington, D.C. h*F2.Table 26 f°F2.Tables 27 and 28 h’Fl. Table 29 f°Fl.Table 30 h’ E ..Table 31 f<E . Table 32 Es . ...Table 33 F2-M1500 Table 34 F2-M3000 Table 35 F2-M3500 Table 36 F1-M3000 . ••••• Table 37 E-Ml500 »&•<»>»«•••••» . • Table 38
3
IONOSPHERE DISTURBANCES . ........ . Page 7
Ionospheric storminees • •••••.•• . ..... Table 39 Ionospheric character and principal storms observed
at Washington, D.C., November, 1944. Magnetic character.
Sudden Ionosphere Disturbances. - None observed at Washington, t).C., during November.
NOTE ON LONGITUDE EFFECT .. Fage 7
Comparison of f°FE observed at Madras, India, end Huancayo, Peru, for times of approximately equal solar zenith angle .... . ............. Figs.20, 21, 22
Comparison of f°F2 observed at Christmas Is. and Huancayo, Peru, for times of approximately equal solar zenith angle. Fig. 23
ERRATA. Page 9
TERMINOLOGY
Note.- The following symbols are used, conforming to the recommenda- tions 'of the International Radio Propagation Conference held in Washing¬ ton, D.C., 17 April to 6 May 1944.
f°F2 » ordinary-wave critical frequency for the F2 layer. The term night F layer will no longer be used. The term F2 layer is new used for the night F layer as well as the daytime F2 layer.
f°Fl - ordinary-wave critical frequency of the Fl layer.
f°E - ordinary-wave critical frequency of the E layer.
h'F2 - minimum virtual height of the F2 layer.
h* Fl - minimum virtual height of the Fl layer.
h'E - minimum virtual height of the E layer.
fEs - highest frequency of Es reflections.
M - maximum usable frequency factor, to be followed by the distance in km. Examplei M3500 represents 3500-km maximum usable frequency factor.
muf « maximum usable frequency.
C 1 - Interpolated value.
( ) - doubtful value.
4
A - characteristic not measurable because of blanketing by sporadic E. /
B - characteristic not measurable because of loss of trace due to absorption.
C - characteristic not measurable because of equipment failure or interference.
T - characteristic higher than upper limit of recorder.
E - characteristic less than lower limit of recorder*
F - spread echoes.
G - f°F2 ^ f°F1.
H - stratification observed within region.
J - ordinary-wave critical frequency deduced from measured extraordinary- wave critical frequency.
K - ionosphere storm in progress.
MONTHLY AVERAGES AND MEDIAN VALUES OF IONOSPHERIC DATA
The tables and graphs of ionospheric data presented here are assembled
by the Interservice Radio Propagation Laboratory for analysis and correla¬ tion principally incidental to IRPL predictions of radio propagation condi¬ tions. These data are furnished by the followingi
Carnegie Institution of Washington (Department of Terrestrial Magnetism) Baffin I., Canada Christmas I. Fairbanks, Alaska (University of Alaska, College, A.laska) Reykjavik, Iceland Maui, Hawaii Trinidad, Brit. West Indies Huancayo, Peru Watheroo, W. Australia
British National physical Laboratory, and Inter-Services Ionosphere Bureau Radio Research Station, Slough, England Great Baddow, England Burghead, Scotland Delhi, India Madras, India Simonstcwn, Union of S. Africa
5
Australian Council for Scientific and Industrial Research Badio Research Board, Australia Brisbane, Q«, Australia Mt. Stroicjto, Canberra, NSW# Australia
Canadian bepe rxment of Rational Defence, Naval Service Churchill, Canada Ottawa, Canada
New Zealand Radio Research Committee Rermtde. Is *
Christchurch (Canterbury University College Observatory) Campbell ^s*
Peoples* Coasaissar for Postal and Electric Communications, Moscow, U.S.S.R* Tomsk, U*S*S*R* Sverdlovsk, U.S.8.R*
National Bureau of Standards, Washington, D.C* Stanford University, (San Francisco), California Louisiana State University, Baton Rouge, Louisiana University of Puerto Rioo, San Juan, P*R.
For their timely value, some of the tables presented are provisional data received by telephone or telegraph in which there may be small or infrequent errors* When filial values are available such errors will be oorracted in later issues of this report*
The final values presented, both in tabular end graphical form, although correct for the quantities stated, as reported to this laboratory, may sometimes lead to an erroneous conception of typical values for the quantity under consideration* Standard sealing praotioe, following recom¬ mendations of idie International Radio Propagation Conference held in Wash¬ ington, D.C*, 17 April to 5 May, 1944, is not yet universal, deviation from standard praotioe being most common in the cases of records where spread eohoes are present* Even when standard scaling pr&ctioe is used, intrinsically misleading results may arise from the monthly average being determined from only a few observations during the month. Two frequent types of such error, both particularly typioal of stations in far northern or far southern latitudes arei
(a) Erroneously high values of monthly average critical frequencies caused by the frequent absence of record for oases where the critical frequency is below the lesser frequency limit of the record<&r® A median, rather than a mean, value of the critical frequency is more significant in such cases, the median being that for all times at which observations were made, the cases of such inability to read the records being counted as less than the lower frequency limit of the apparatus*
(b) Erroneously high values of monthly average F2-layer critical fre® queue ies caused by the frequent occurrence of cases where the FI-layer oritioal frequency exceeds that of the F2-layere This is ahmraotoriitie of sunner months during sun@pct*»oycle minijsua, particularly in northers, latitudes* In this ease, also, aedi&a values are more significant than
6
mean values, the median being that for all cases where observations are made, those cases where missing values result because of higher f°Fl being counted as less than the f°Fl# When, as is often the case, no great discrepancy is likely to exist between f°Fl and f°F2, a typical value of f°F2 may be obtained by taking the monthly average of observed f°F2 together with observed f°Fl for the cases where no f°F2 could be measured*
The discrepancy between predicted and observed values of monthly average critical frequencies, particularly for far northern stations, is frequently because of the above reasons, the predictions being in¬ tended to represent typical values for the location under consideration*
It may be noted by inspection of the figures presenting comparison of data received for the months of August, September, October, and November with IRPL predictions made four months in advance, that, generally, the predictions have been in error by being too low, especially in temperate latitudes*
These predictions are based on average trends of solar activity as measured by sunspot number* In the past few months this activity has been somewhat abnormally high* Occurrence of both sunspots and oaleium flooculi during the past few months has been slightly more frequent at high than at low solar latitudes, indicating that perhaps the sunspot minimum has just been passed®
Because of great fluctuations in solar activity, however, an observa¬ tion period of but a few months is so short as to render a final conclu¬ sion as to this premature as yet*
IONOSPHERIC DATA FOR EVERY DAY AND HOUR
These data, observed at Washington, D*C*, follow the soaling prac¬ tices recommended by the International Radio Propagation Conference held in Washington, D*C*, 17 April to 6 May 1944* (Cf* IRPL-C61, pp*36-39)*
Because of the high variability of observed fEs, mean values are of little practical significance and are not given here®
Mean values of other quantities are ordinarily given for all days of the month as well as for quiet days only. No periods of pronounced stormi¬ ness having occurred during November, only one mean is given here* The criteria for selecting periods of ionospheric storminess, whose data are deleted in obtaining the mean values for quiet days only, are presented in XRPL-R5, BCriteria for Ionospheric Storminess", available to authorised persons upon request to the Chief of IRPL, National Bureau of Standards, Washington 26, D*C*
In determining the median values included in Tables 26 through 36, the following procedure has been adopted*
7
For all characteristics s Where the value is missing because of A, B, or C (see Terminology* above)* that hour is omitted from the median
count*
In addition*
For critical frequenciesg For all layers* where a value i® missing because of 1
(see Terminology* above)* it is counted as less than the lower limit of the recorder*
For virtual heights* Values missing for any reason are omitted from the median
count*
For muf factors * Values missing for any reason are omitted from the median
oount*
IONOSPHERE DISTURBANCES
Table 39 presents ionospheric character figures observed at Washington* D*C*, during November 1944* as determined by the criteria presented in IRPL-R5, cited above* together with American magnetic K-flgure® which are usually covariant with them* No major disturbances were noted at Washingtm^ D*C** during November*
NOTE ON LONGITUDE EFFECT
Ionospheric data recently received from Ifedr-r.s, India (!8#0°N, 8Q*2CB) wad Chrissmas X* {2*Cjts, Ilff »£>%}* both located near1 the geomagnetic equator* at geomagnetic latitude® 3°N and 2°N* respectively* affords the possibility of comparison with data observed at Euane&yo* Peru (12*0°S, 76*5<W), at geomagnetic le /itede 0*b°S* The three station® are thus all near the geomgnetio ©qeator* but with quits different geographic latitudes* This comparison is c.T particular interest in that the variation of ionospheric characteristic?* with geomagnetic latitude formed the basis of division of tha world into ifct three icnes (B* I* and W) recoirenended by the Interna® tlon&l Radio Propagation Conference held in Washington* D@S** 17 April to S May 1944, for coverage by prediction charts* This division was adopted 1 September 1944, in the first of the IRPI/-D series reports* and f°F2 and
F2-4000 muf charts have since been issued separately for the three tones* Madras* India, is located in the **1* sens, Christmas I* in the *i* sons, and Buaaeayo, F@rvs# is the sons*
8
In order to augment the usefulness of actual data in the construction of FS-laye^ prediction charts, it has been heretofore assumed, in the ab¬ sence of observed data from certain locations, that the diurnal variations of ionospheric characteristics are similar at places having equAl geo- magnati? latitudes and equal solar zenith angles or equivalent seasons* For example, after suitable corrections for the effeot of changing solar activity and for ’‘hemisphere effect” had been applied, data for a southern hemisphere W»zone station, for a time six months from that for which pre¬ diction is made, have been used at an equal north latitude in the E-zone*
Inspection of Figs. 20, 21, and 22 shows that a fair degree of similar¬ ity exists for the daytime values of f°F2 at Madras and Huanoayo for times of approximately equal solar zenith angle at equivalent seasons* The be¬ ginning and end points on the Madras curves are considered less reliable than other points, and probably represent fewer observations* It may be "Tpted, by comparing Huancayo observations for January and Maroh, that night values of f°F2 may be conspicuously different for equal solar angles even at the same location.
Fig. 23 presents a mass plot of provisional data received telegraphically from Christmas I. for the first fifteen days of December, 1944, in compari¬ son with August and April, 1944, and Deoember, 1943, values of f°F2 for Huancayo, Peru. It may be noted that the Christmas I. data for December b*?ar greatest similarity to data from Huancayo, Peru, for the same month (December), and not to the data from Huancayo for months of approximately equal solar zenith angle (April and August), although the curves for these bear some resemblance to each other.
Mich further investigation is necessary before any but preliminary speculations oonoerning the oause of this effeot oan be made. It is interesting, hwrever, to oonsider the possibility of its course in the seasonal variation of solar partiole radiation arriving on earth* It was previously suggested in "Radio Propagation Conditions", issued August, 1944, p*4, that partiole radiation may oause ionization at various levels in the atmosphere. The greater amount of particle radiation received during equinoctial seasons than during solstioe seasons, as indicated by greater prevalence of ionospheric storminess during the equinox months, may perhaps explain qualitatively the fact that the night values of f°J8 at Huancayo during equinoctial periods are greater than those during the solstioe seasons* Ionization at F-layer level®, rather than at the D- or B-layer levels characterizing storminess at higher latitudes might be ex¬ pected from consideration of space variations in the earth's magnetic field* The comparative lack of difference between daytime values of foF2 for equal solar zenith angles and equal geomagnetic latitudes may be explained by the particle ionization's appearing as increased fEs, rather than as ioniza¬ tion in the F layer (Cf* above reference)* High midday values of fEs re¬ ported from Huancayo also lend some support to this suggestion.
9
ERRATA
1* In the second previous issue of this report, IRPL-F2, Table 29, presenting final data for August 1944, observed at Huancayo, Peru, the value of f°F2, 6,42 Mo, given for time 0600 should be that for time 0800.
2* In the previous issue of the report, IRPLr»F3, the first paragraph, page 8, should be deleted. Missing values were omitted from the median count*
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Novem
ber, 1944
Table 39
Ionospheric Storminess, November, 1944
Day Ionospheric 00-12 GCT
Character* 12-24 GCT
Principal Storms^ Beginning End
GCT GCT
1.1a gne tic C0-12 GCT
Character^ 12-24 GCT
November 1 2 2 0 1 2 1 2 1 0 3 2 2 1 2 4 3 3 3 2 5 2 ♦♦♦ 3 3 6 2 3 3 1 7 3 2 1 2 8 2 3 2 0 9 3 1 2 1
10 ' 8 1 1 2 11 2 T
X 1 1 12 2 2 1 0
13 • 2 0 0
14 2 % A 1 1
15 2 2 1 0
16 2 2 2 1
17 1 2 0 1
18 1 1 2 2
IS 1 1 3 1
20 1 ♦♦♦ 3 3
21 ♦♦♦ ♦♦♦ 1 0
22 1 2 0 1
23 1 1 1 1
24 3 3 1 0
25 2 2 0 1
26 2 2 2 1
27 2 1 1 1
28 3 2 1 1
29 2 2 1 1
30 2 i_1 1 2
Washington, D.C., during 12-hour period, on an arbitrary scale of 0 to 9, 9 representing the greatest disturbance*
♦♦Average for 12 hours of American magnetic K-figure, determined by a number of observatories, on an arbitrary scale of 0 to 9, 9 rep¬
resenting the greetest disturbance* ♦♦♦No record.
/No major disturbances were observed at Washington, D*C*, during
November, 1944*
00 02 04 06 06 i 12 14 16 18 20 22 0 0
1
3.5 LLL J. - J
O O
2E 20
0J LI_
1.5
1.0
12.0 110
100
9.0
8.0
^ 70
2 6.0
P 50
> 45
^ 40
W 3.5
2 10 o:
^ 25 —I < £ cr o
1.5
LO
— - OBSERVED C
-PREDICTION MADE FOUR MONTHS BEFORE “
u7 L- • - i Ld
FZ D
s£C s' V5
s' \
N
/ FI \j /
& S l V.
E< r\
/
1 3HE
\"
* ’
V _
/
I J
j /<Ss
sJ 1
- t; S
/
i \ j
/. /•
/ •
Li J I\ LOCAL TIME 00 02 04 06 08 10 12 14 16 18 20 22 00
Fig 3 WASHINGTON, D C 390°N, 775°W NOVEMBER,1944
00 02 04 06 08 10 12 14 16 18 2b 22 00
30
o 2_ O
^ 2 0
OJ Li-
1.5
1.0
11.0 — -OBSERVED
9.0 —lor -3-—
8.0
^ 7.0
z 6.0
P 5.0
cr> F2 —»LU—
zf —Z>r D
l' i • /)
t V
T / \
j /
A- > 45
g 4.0
^ 3.5
7 j Ft A
h s
L
7 Es N
3 —■-
or
^ 25
/. 1 • ’E
\
-X
> / > --
l <
° 2D h-
cr. o
1.5
10
— — ♦
♦ / /(
V f
^ .
1 r -Si
/
i
rr
\« V
l
r r
i
l /• i.
L
\ \ \
\ LOCAL TIME
00 02 04 06 08 10 12 14 16 18 20 22 00
Fig.5. SAN FRANCISCO, CALIFORNIA 37 4°N, I22.2°W NOVEMBER,1944
00 02 04 06 08 10 12 14 16 18 20 22 00
O 2.5 o o ^ 2.0
1 OJ U-
1.5
1.0 12.0 11.0
10.0 V -OBSERVED - - — PREDICTION MADE FOUR MONTHS BEFORE —
m* S-
2 70 z 6.0
P 5.0
> 45 40
S «
2 10 <r
^ 25
—• F2 «LU^ HO 1>k
G r> N| r /
FI
r >i
—
v j £■
j~-
; \ J /. V \ \
\\
/ y <N
Y A v —
J < S2 2j0 h- cr o
1.5
LO
y V \
1/ ./ /
= 0 \
L r \
\
\ \
LOCAL TIME | || i i | L. v/w I— * iiti u. |
00 02 04 06 08 io 12 14 16 18 20 22 00
Fig. 7 BATON ROUGE, LOUISIANA 30.5°N, 91 2°W NOVEMBER,1944
-LIMITING FREQUENCY= 3 Me
-LIMITING FREQUENCY = 5 Me
-LIMITING FREQUENCY = 7 Me
Fig8 BATON ROUGE, LOUISIANA NOVEMBER,1944
00 02 04 06 08 10 12 14 16 18 20 2 2 00
Fig 9 TRINIDAD, BRIT WEST INDIES 10.6°N, 6I.3°W OCTOBER,1944
Fig 11 BRISBANE, Q, AUSTRALIA 275°S, 153 0°E OCTOBER,1944
--LIMITING FREQUENCY - 3 Me
-LIMITING FREQUENCY■5 Me
-LIMITING FREQUENCY = 7 Me.
Fig 10 TRINIDAD, BRIT. WEST INDIES OCTOBER ,1944
-LIMITING FREQUENCY - 3 Me
-LIMITING FREQUENCY = 5 Me
-LIMITING FREQUENCY - 7 Me
Fig. 12. BRISBANE, Q , AUSTRALIA OCTOBER, 1944
00 02 04 06 08 10 12 14 16 18 20 2 2 00
30
o
O
2 20
0J li_
1 5
1.0
12.0 —1—I—1—I—1—I—I'T'I "I" " i l"TT" 110
100
9.0
8.0
o 70
z 6.0
P 5.0
V 45
L? 40
LU ~t c
- ... OBS PRE
ER DIC
VE
Tl
D DN IY AL )E F( DU R MC )N’ ms 3E r0F IE
— UJ
cr* U)
z. F? 3
—u _ C/I
FI \
/ — — \ / i/ ' / / V-
3 35
S 30 cr
^ 25 -J <
p 20
cr o
1.5
/ E "" k
\ \
. /
J
l
//
N\ V
\ \
/* j ’ V
\
• 1 Es = 0 \
\
i c /.
3 ;i
•\ LOCAL TIME 00 02 04 06 08 10 12 14 16 18 20 22 00
Fig 13 MTSTR0ML0, NSW, AUSTRALIA 35 3°S, 149 0°E OCTOBER,1944
CR
ITIC
AL
FR
EQ
UE
NC
Y (
f°)
IN
MC
E2
-M3
00
0
00 02 04 06 08 10 !2 14 16 18 20 22 00
3.5
30
O 2.5 O O ro op
OJ Li.
> 5
1.0 12.0 1 ! 0
— .... -
— — -
= -08$ SERVED 10.0
9.0
8.0
& 70
Z ^
P 5.0
> 45
z 40 UJ 35
- ...
- P RE IDI CT ON vlADE FOUR MONTHS BEFORE -
_ i r lZ cnl .—
rr, A -!uj— On
—
z- jA ? ..
fn1 / \ / \
v 4 FI \
s V-
i l--
\ •v
r>
S 3.0 CC
^ 25
<r
h~ 20 or o
1.5
1.0
\ ✓
* \ \
A
j
JL /
/ \
\
A A !
i \
\
\ i
i c /• !'•
L±
tT
il
ii LOCAL TIME
)0 02 04 06 08 10 12 14 16 18 20 22 00
Fig 18 MADRAS, INDIA
80 2°E , I3.0°N AUGUST,1944
00 02 04 06 08 10 12 14 16 18 20 2 2 00
—
30
o o ^ 2 0
OJ
^ 15
1.0
12.0 11.0 100
9.0
8.0
^ 70
z 6X)
P 50
> 45 g 40
W 3.5
S ao cr
^ 25
<1
F= 20 cr o
1.5
- OBSERVED
- 3Rf EDI CT ON DE F ou R M ON TH S BE FO RE
r" f? 'v)
lij! --
<4>: / \ CC* / / U
2 Y -Z!" —V
f
/ / M L \
fX * \ \
s t — " s
\ s f b
's
A
\ j s
A V
7
/ A j A \
' J,
/ \
/?
l \
LOCAL TIME n 00 02 04 06 08 10 12 14 16 i8 20 22 00
Fig 19 MADRAS, INDIA 80 2°E, 13 0°N JULY,1944
CR
ITIC
AL
FR
EQ
UE
NC
Y (
f°)
IN
MC
VIR
TU
AL
HE
IGH
T
IN
KM
| |
^
CR
ITIC
AL
FR
EQ
UE
NC
Y (
f°)
IN
MC
VIR
TU
AL
HE
IGH
T
IN
KM
00 02 04 06 08 10 12 14 16 18 20 22 0 0
1
I
£ *
Z 400
LU I
_l < Z>
(Z >
i
J
1 1
10
9
O 8 2
? 7
o
> 6 O z
3 5 o UJ
CH RIS TM AS I DE C 1 -15 194 4 HUANCAYO, PER
* SINGLE OBSERVATION — DECEMBER, 1943
•THREE 0BSERVA •FOUR OBSERVA
TIONS AUGUST 1944
TIONS . •
\ i ff j #
. \. *
: . * # 11 1 s
* * )/ ’ T
1 # A V j
• }u • hI V
s \ s!* •
5 j * • * _ — t kp
i /• • V _ V \J
i \
11 1 • \
V \ it .
V N \
, > ii *
li.
_J < 3 o
g 2
1
s \ V !i s\ \
# # \\ V) ?>
LOCAL TIK IE
00 02 04 06 08 10 12 14 16 18 20 22 00
Fig 23 COMPARISON OF f°F.° V, CHRISTMAS 1 (2 0°N, 1573 W;
AMD HUANCAY0 PERU'.12.0° S. 75 3»W)
IRPL REPORTS
Daily
Telephoned and telegraphed reports of ionospheric, solar, geomagnetic and radio propagation data from various places.
Radio disturbance warnings.
Weekly
IRPL-J. Radio Propagation Forecast.
Monthly
IRPI-D. Basic Radio Propagation Conditions - Three months in advance IRPL-E. Discontinued. IRPL-F. Ionospheric Data.
Bimonthly
iRPL~Cr. Correlation of D.F. Errors with Ionospheric Conditions.
Quarterly
IRPL-A.
IRPL-B. IRPL-K.
IRPL-M.
Recommended Frequency Bands for Ships and Aircraft in the Atlantic and Pacific.
Recommended Frequency Bands for Submarines in the Pacific. Best Radio Frequencies for Aircraft and Ground Stations in
the Atlantic. (WIMS Appendix U) Fr equency Guide for Merchant Ships.
Semiannual
IRPL-H. Frequency Guide for Operating Personnel.
Special Reports, etc.
IRPL Radio Propagation Handbook, Part 1. IRPL-Cl through C6l. Reports and papers of the International Radio
Propagation Conference, 17 April to 5 May 19^» IRPL-R. Unscheduled reports.
Rl. Maximum Usable Frequency Graph Paper.
R2 and R3. Obsolete. R4. Methods Used by IRPL for the Prediction of Ionosphere
Characteristics and Maximum Usable Frequencies.
R5- Criteria for Ionospheric Storminess. R6. Experimental studies of ionospheric propagation as applied
to a navigation system. R7. Further studies of ionospheric propagation as applied to
a navigation system. Rg. The Prediction of Usable Frequencies over a Path of Short
or Medium Length, Including the Effects of Es. IRPL-T. Reports on Tropospheric Propagation.
Tl. Radar Operation and Weather. (Superseded by JANP lGl).
T2. Radio coverage and weather. (Superseded by JAET 102;.
)
n o T> < V