united states department of the interiorwoc-a ro« ouar'tirrutniau physics environmental data...
TRANSCRIPT
UNITED STATES DEPARTMENT OF THE INTERIOR
SEPTEMBER 1986
GEOLOGICAL SURVEY
PRELIMINARY GEOMAGNETIC DATACOLLEGE OBSERVATORY
FAIRBANKS, ALASKA
OPEN FILE REPORT 86-03001
BARROW
THIS REPORT WAS PREPARED UNDER THE DIRECTION OF JOHN B, TOWNSHEND, CHIEF OF THE COLLEGE OBSERVATORY, WITH THE ASSISTANCE OF THE OBSERVATORY STAFF MEMBERS: H.K, REX AND L,Y, TORRENCE AND IN COOPERATION WITH THE GEOPHYSICAL INSTITUTE OF THE UNIVERSITY OF ALASKA, THE COLLEGE OBSERVATORY IS PART OF THE BRANCH OF GLOBAL SEISMOLOGY AND GEOMAGNETISM OF THE U,S, GEOLOGICAL SURVEY,
Explanation of Data and Reports
Magnetic Activity Report
Principal Magnetic Storms
Preliminary Calibration Data and Monthly Mean Absolute Values
Magnetogram Hourly Scalings - Five Quietest Days
Sample Format for Normal and Storm Magnetograms
Normal Magnetograms
Storm Magnetograms (When Normal is to disturbed to read)
COLLEGE OBSERVATORY PRELIMINARY GEOMAGNETIC DATA
EXPLANATION OF DATA AND REPORTS
INTRODUCTION OBSERVATORY LOCATION
The preliminary geomagnetic data included here is raade available to scientific personnel and organizations as part of a cooperative effort and on a data exchange basis because of the early need by some users. To avoid delay, all of the data is copied from original forms processed at the observatory; therefore it should be regarded as preliminary. Inquiries about this report or about the College Observatory should be addressed to:
Chief, College Observatory U.S. Geological Survey SOO Yukon Drive Fairbanks, Alaska 99701
Requests for copies of the magnetograms except for the current month should be addressed to:
World Data Center A N'OAA D63, 325 Broadway Boulder, Colorado 80303
The College Observatory, operated by the U.S. Geological Survey, is located at the University of Alaska, Fairbanks, Alaska. It is near the Auroral Zone and the northern limit of the world's greatest earthquake belt, the circum-Pacific Seismic belt. Although the observatory's basic operation is in geo magnetism and seismology, it cooperates with other scientists and organizations in areas where the facil ity and personnel can be of service.
The observatory is one of three operated by the USGS in Alaska. The others are located at Barrow and Sitka.
The position of the observatory site is: Geographic latitude.......64°51.6'NGeographic longitude..... .147° 50.2'WGeomagnetic latitude......+64.6°Geomagnetic longitude... ..+256. 5°Elevation.................200 meters
GEOMAGNETIC DATA
Normal, Storm and Rapid Run magnetograms and appropriate calibration data are processed daily at the observatory and are available for analysis or copying. Also available, are mean hourly scalings, K-Indices, selected magnetic phenomena reports and on a real-time basis are recordings from a 3-compo- nent fluxgate magnetometer and F-component proton magnetometer.
'.fagnetic Activity The K-Index: The K-Index is a logarithmic measure
ment of the range of the most disturbed component (D or K) of tne geomagnetic field for eight intervals beginning 0000-0300, 0300-0600...2100-2400 UT. It is a measure of the difference between the highest and lowest deviation from a smooth curve to be expected for a component on a magnetically quiet day, within a three hour interval.
The Equivalent Daily Amplitude, AK: The K-Index is converted into an equivalent range, ak, which is near the center of the limiting gamma ranges for a given K. The average of the eight values is called equivalent daily amplitude AK. The unit 10y has been chosen so as not to give the illusion of an accuracy not justified.
The schedule for converting gamma range to K, and K to ak is as follows:
Gamma Range K - Index C< 25 0
25 <50 <
100 <200 <350 <600 <1000
1000 <1650 1650 < 2500 25CX>
50100200350600
ak C 3
15274880 UC 240 400 (10y)
The Magnetic Daily Character Figure, C: To each Universal day a. character is assigned on the basis C=0, if it is quiet; C=l, if it is moderately disturbed; C=2, if it is greatly disturbed. The method used to assign characters at the College Observatory is based on AK as follows:
AK Range £ 0»I1 011«*50 150+ 2
Routine assignment of C was discontinued at College on January 1, 1976.
Selected Phenomena & Outstanding ?fegnetic EffectsPrior to January 1, 1976, the Normal and Rapid
Run records were reviewed at the observatory for selected magnetic phenomena and the events identified were forwarded to the IUGG Commission on Magnetic Variations and Disturbances. This was discontinued on January 1, 1976, but a report on Outstanding Magnetic Effects is prepared monthly for this report.
Principal Magnetic StormsGradual and sudden commencement magnetic distur
bances with at least one K-Index of 5 or greater, which are believed to be part of a world-wide disturbance, are classified as principal magnetic storms. The time of the storm beginning and ending; direction and amplitude of sudden commencements; period of maximum activity; and storm range are reported. Monthly reports of these data are forwarded to the World Data Center A in Boulder, Colorado.
Magnetogram Hourly ScalingsMagnetogram hourly scalings are averages for
successive periods of one hour for the D, H and Z elements. The Value in the column headed "01" is the average for the hour beginning 0000 and ending 0100. Note that the values on the scaling sheets are in tenths of mm with the decimal point omittei. The user of these scalings should keep in mind that the tabular values are hourly means and if he is interested in the detailed morphology of the magnetic field, he should refer directly to the magnetograms.
MagnetogramsThe normal magnetograms in this report are repro
duced at about one-third the size of the originals. Preliminary base-line values and scale values adopted for use with the original magnetograms are included. For days when the magnetic field is too disturbed for the Normal magnetogram to be readable, Storm magnetograms are reproduced.
Absolutes, Base-lines and Scale ValuesTo determine the absolute value of the magnetic
field from the hourly means or from point scalings the following equations should be used:
D=B£+d-&v H=BH+h-SH ; Z=B-7+z-S2where D,~H and"2 are' absolute values;Bp, B^ and &% are base-line values;Sp, Sj, and S£ are scale values;and d,* h and z are scalings in millimeters.
NUAA FORM 76-133 U - s - DEPARTMENT OF COMMERCE(9-72) NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION
MAGNETIC ACTIVITY (Greenwich civil time, counted from midnight
DATE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1718
19
20
21
22
23
24
25
26
27
28
29
30
SI
to midnight)
K-INDICES
r> ic Ot <M0 6 0 -A A & A0 0 O O
32252545221032102214
31142113104413241111
11014767346642231236
1101244234443344 3253
43120112245534653336
45673246324431332114
in a> »- CM
»IM
A J> £ i_ _ _ eg
111
531121211322
310300101200000
1024534222216 5 3
112121334362 322
2111025646436 5 3
6425 3 3211222300
21222
11100
43311
2331 3
12333
2 >* >
230
SUM
1726111218
1411121204
1039301727
091928
~ 26 23
1509343432
3629191911
OBSERVATORY
College, AlaskaMONTH AND YEAR
September 1986
AK
1225050610
0906080702
0662321031
04122124 16
0904383835
5228121007
TIME SCALE ONMAGNETOGRAMS
20 mm/hr
SUDDEN COMMENCEMENTS
d h m
POSSIBLE SOLAR-FLAREEFFECTS BASED ON
INSPECTION OF GRAMS ALONE (WITHOUT
REFERENCE TO DATAFROM OTHER SOU«CES)
BEGIN END
d h m d h m
K SCALE USED: D
LOW ER LIMIT FOR K = 9. ....... 675.7CURRENT SCALE VALUE........ 3-71
LOWER LIMIT FOR K - 9 ........ <c21U
SCALINGS AND COMPUTATIONS HAVE BEEN CHECKED.
APPROVED
H Z
322.2 ^ mm ^7.81 (7/mm)
2520 (to nearest 107)
John B. Townshend, Chief, College ObservatoryOBSERVER IN CHARGE
NOAA FORM 76-133 SUPERSEDES C&GS FORM 6lE U.S. GOVERNMENT PRINTING OF F I C E : 1973-761-857
NOAA
FOR
M 86-500
(11/
73)
Data f
rom
Indi
vidu
al Ob
serv
ator
ies
iPR
INCI
PAL MA
GNET
IC STORMS
COLL
EGE
OBSE
RVAT
ORY,
COLLEGE, ALASKA
Sept
embe
r 19 86
WO
C-A
rO
«
OU
AR
'TIR
RU
TN
IAU
PH
YS
ICS
E
NV
IRO
NM
EN
TA
L D
AT
A S
ER
VIC
E,
NO
AA
B
OU
LD
ER
, C
OL
OR
AD
O S
OtO
ft U
.S.A
.
Obs
.2
lett
er
XAQA
ee
tfe
CO
Geo
oag.
lat.
64?6
N
Com
men
cem
ent
day
hr
min
(U
T)
NO
PRIJ
i
typ
e
ICPA
L I
SC -
amp
litu
des
D(
f)
TAG
NET
IC
H(Y
)
3TOR
MS
Z(Y
)
SCA
LED
1 M
ax.
3 hr
- in
dex
K
day
TH
IS M
C
[3 h
r -
per
iod)
NTH
.
K
Ran
ges
D(f
)H
(Y)
Z(Y
)
UT
End
day
hr
/"/£-*
KQHKA1 MAGKTTOGKA.FE
CCKPOREKTPERIOD CALIBRATIOH
FROX TO SCAJZ VALUE BASE LIRE
-7
7.7 ^/
STORK MAGHETOGRAPE
COMPCKSHT
I)
E
Z
PERIOD
FROM
0000 /y.TT ^-/^/^^
f
*
TO
3- y-0<? t/.-r. 3 -So ~ZL
"
//
CAIIBRATIOIS
SCALE VALUE | BASELIHE
7 <?/ ^4> r *^
j
£t-3 (7 rf 7*13. y y/t,^
4^. 7 ^^-
2.j*^/7^r
/^ 7^/
£-4- /gr^
RAPID RUN MAGKETOGRAPH
CQMPCRENT
D
E
Z
PERIOD
FROM TO
CALIBRATIOK
SCALE VALUE
MONTHLY MEAK ABSOLUTE VALUES*
D E Z
2.i c 2,%7,^ /zr&r tti-L?* COMPUTED FROM FIVE QUIETEST DAYS DURING MONTH.
DAYS USED: S £. f .5> ,V- j A? j /£ ) 22_ ) ;
\V\>
H
I l/H
h
Val
ues
d
ie
hi
tru
ths
of
»in
ami
d-t
- Av
e> a
(|es
f
, NA
GNt
WG
RAM
IIO
IIRI
Y Sj
TAI
INf.S
-
MV
| O
lIIM
FS
I DA
YS
(IIN
IVfM
'iAl
IIM
I )
Su
cc
-ss
lve
P
ei I
nils
o
f O
ne
Kn
ur
l»>t
| I l
inin
g
at
Md
lnli|l
it.
Sin
tirt
d.ii
- (d
irecti
on
s
twve
be
en
ap
plied
lie'id
llvr
Val
ues
in
H
e.|
wlt
li
Min
us
.
DAY
Vi
' i
T i
HOUR
OA
KY
SU
M
DA
ILY
M
EAH
MEA
N
J ^:
n 13Q //e H8
AC
XJ
2.06
no 53
3/7
3
/O?
.422
...
/2J
IbQ
Md,
,
/4Q
//^ eo
3O
90
.&*
DID
J3
A»
75
/OO
/O
/ 10
810
3.3
8-
^/ 13&
IBQ
/JL9
-2.± 90
fii
i. /Q
fc
IQfl
Jd^.
...
13O
.
/fci
173
no Uo
.
3A3O
i OB
no IQQ
icL..
/H J3B
,
/7Q /^J 1*0 95-
H
/A9
25O
2.12
«23B
23
k
217
21 A
/97
5573
Qku.,
2.07
233
337
^03
5-4^
7
II
/O 25S.
2/7
2)0
2/5
"
S'lM
-L3B
as/
213
3.11
,
0-17
AD
7
2D
S
.2/9
.
2A7
aa.d
_A
A,^
2^.
8
15 _
J.Q
7
/0?
174
184
MI7
17Q
ZD
2 207
2£>3
,^20
5 ^
^
/50
/4
2
Z /O
3JL
JQ7
wo
188
117
2O7
aoo
2J7
207
<iO
(^
MQ
..,
3J33
i£fl_
46^
CO
MPO
MIN
I
DAY
DA
ILY
SU
M
DA
ILY
M
EAN
FO
RM
AT
FO
R
NO
RM
AL
&
ST
OR
M
MA
GN
ET
OG
RA
MS
(SA
MP
LE
ON
LY)
CO
LLE
GE
, A
LAS
KA
NO
V 1
0, 1
973
0
TR
AC
E
NEW
U.
T.
DA
Y B
EG
INS
H
ER
E
INC
RE
AS
ING
H
OR
IZO
NTA
L IN
TE
NS
ITY
TEM
PE
RA
TUR
E
TR
AC
E f S
EE
P
RE
LIM
INA
RY
C
ALI
BR
AT
ION
D
AT
A
FOR
S
CA
LE
VA
LUE
S a
BA
SE
LIN
E
VA
LUE
S
CO
o: o OH- LUzCD
tr o
°\
CO
oh- LU
(T O
COLLEGE. ALASKA |
SEP 6, 1986 I SEP 7, 1986
cc. o oH UJ Z O
(T O
ll
(Te> oH LU
o: o
- -I D
cc e> oHUJzCD
(T O
CO^ < o: o oH LU
(T O
CO2 < or o oLJz o <2
-J < 2o: oz
""^Al^M^
v-^-^^^^^^w^^-24 U.T.
v^^^^VV)
COLLEGE, ALASKA
SEP 28. 1986I I
SEP 29. 1986
V^A-^-
rV\v_/
j D t***
<" Is T l * '<o:CD0i-UJ2CD<^
-J<2o:
5
H jw*^
§
'--
o "2
~
D >A .
!
~\
SHI
T
w-^
P
1
-P
COLLEGE. ALASKA'
*^v*
**V
A^-
-^
2
y^H
My
«> 0
^V^
COLLEGE, ALASKA
SEP 30. 1986
2 0
SEP 29. 1986
w
V^x
'**>
^v-
A.V^
__.^
^%»*
2
-p
2
SEP 30, 1986
*-*_>-!
4U.T.
W-
.«, ,.
4
OCT 1.1986
4U.T. 4
<***>
-<\J>
Nxl
x*
*s^s
^^^
r^_f VA
i
_l^
!
~LJ "I
i
__
4
I
1,
^_^
vf^
/ /** 1
/|Ti
,
i
,
'^
x-2
V/
V
2
<^^*
*^
X
"X
X
/^
^.
A/
i
v»-
/^I
^
ST
OR
M
MA
GN
ET
OG
RA
MS
20O
mm
ST
OR
M
MA
GN
ET
OG
RA
MS
I /
I /
S58
Ml
OU3. AUJU SEPJ4 HE
COs< or o oK LU 2 O
cr oCO