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UNITED STATES DEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEY
PRELIMINARY GEOMAGNETIC DATACOLLEGE OBSERVATORY
FAIRBANKS, ALASKA
FEBRUARY 1985 OPEN FILE REPORT 85-0300B
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: J,E, PAPP/ E,A, SAUTER/ L,Y, TORRENCE/ P,A, FRANKLIN AND IN COOPERATION WITH THE GEOPHYSICAL INSTITUTE OF THE UNIVERSITY OF ALASKA, THE COLLEGE OBSERVATORY IS A PART OF THE BRANCH OF GLOBAL SEISMOLOGY AND GEOMAGNETISM OF THE U,S, GEOLOGICAL SURVEY,
Explanation of Data and Reports
Magnetic Activity Report
Outstanding Magnetic Effects
Principal Magnetic Storms
Preliminary Calibration Data and Monthly Mean Absolute Values
Magnetogram Hourly Scalings
Sample Format for Normal and Storm Magnetograms
Normal Magnetograms
Storm Magnetograms (When Normal is too disturbed to read)
COLLEGE OBSERVATORY PRFIIMIMARY GFOMAGNFTIC DATA
EXPLANATION OF DATA AND REPORTS
INTRODUCTION OBSERVATORY LOCATION
The preliminary geomagnetic data included here is made 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 800 Yukon Drive Fairbanks, Alaska 99701
Requests for copies of the magnetograms except for the current month should be addressed to:
World Data Center A NOAA 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......+64.6PGeomagnetic longitude.....+256.^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.
ActivityThe K- Index: The K-Index is a logarithmic measure
ment of the range of the most disturbed component (D or H) of the 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 0< 25
25 < 5050< 100
100< 200200< 350350< 600600<10001000 <16501650 < 25002500+
ak 0 3 7
15 27 48 80 140 240 400 (I0y)
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 C
Routine assignment of C was discontinued at College on January 1, 1976.
Selected Phenomena & Outstanding Magnetic 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 omitted. 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^Bp+d-Spj I^Bjj+h-Sjj; Z^^-z-^where D, H and Z are absolute values;Bp, Bu and B^ are base-line values;Sp, Sjj and Sz are scale values;and d, h and z are scalings in millimeters.
NGAA 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
2223
24
25
26
27
28
2930
31
to midnight)
K-INDICES
m to O> IMo o o ^& A 5 AO O O O
22661324121200000343
34563237222624563344
22252334000322352231
001123350 1-2 2 01002455
00112122103334452355
122111135766
« co «- IM
A A 4>*[M*
«- IM
5 4 3322641001652
6767335556 5 3655
4 5 3541533452001
5 5 26 5 3001 211511
3434313 2 .2441432
001331753
22002
32422
20231
210 20
21120
142
SUM
3019170125
4030313332
2522162610
162806 0723
1416152724
081741
OBSERVATORY
COLLEGE, ALASKA
MONTH AND YEAR
FEBRUARY 1985
AK
3411160025
6144343933
2118132205
152903 0323
0909nrtUo2321
031170
TIME SCALE ONMAGNETOGRAMS
20 mm/hr
SUDDEN COMMENCEMENTS
d h m
POSSIBLE SOLAR-FLARE EFFECTS BASED ON
INSPECTION OF GRAMS ALONE (WITHOUT
REFERENCE TO DATAFROM OTHER SOURCES)
BEGIN END
d h m d h m
K SCALE USED: D
LOWER LIMIT FOR K = 9. ........ 675.7
CURRENT SCALE VALUE........ 3-72
LOWER LIMIT FOR K s 9 ........ 2510
SCA LINGS AND COMPUTATIONS HAVE BEEN CHECKED.
H Z
322.2 (mm)
7.83 (7/mm)
2520 (to nearest 107)
APPROVED JOHN B. TOWNSHEND, CHIEF, COLLEGE OBSERVATORYOBSERVER IN CHARGE
NOAA FORM 76-133 SUPERSEDES CftGS FORM 818 U.S. GOVERNMENT PRINTING OFFIC E: 1973-761-887
OBSERVATORY
OUTSTANDING MAGNETCOLLEGE, ALASKA
il LI 1 LLIo MONTH YEAR
FEBRUARY 1985
DATE
04
05
14
15
16
17
TIME
U.T.
18xx
0347
Olxx
16xx
20xx
18xx
NATURE OF
PHENOMENON 1
pc 5
ssc*
pc3, pc4, pc5
pe3, pe4, pc5
pe3, pc4
pc4
REMARKS
-
IDENTIFIED BY: J£p VERIFIED BY:
1. NATURE OF PHENOMENON: ssc, sse*, si, si*, b, bp, bs, bps, pel, pc2 - - - pc5, pg, pi 1, pi 2, sfe.
NOAA
FORM 86
-500
(11/
73)
Data
fro
m In
divi
dual
Observatories:
PRIN
CIPA
L MA
GNET
IC STORMS
COLL
EGE
OBSERVATORY, CO
LLEG
E, ALASKA
FEBR
UARY
19
85
WD
OA
FO
R S
OL
AR
-TE
RR
ES
TR
IAL
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 B
OJO
t U
.S.A
.
Obs.
Z l»
tt«r
IAOA
eod«
CO
*
Geomag.
lat.
64?6
N
Commencement
day
05 08 27
hr m
in
CUT)
0347
09XX
21XX
type
S.C.*
SC -
ampl
itud
es
DC1)
+16
H(Y)
+135
Z(Y)
+22 -
M*x.
3
hr -
index
K
day
06
07 08 09 10 28
(3 h
r -
period
)
6 4,
5
4 4,
55 2,
5
K 7 7 6 6 6 7
Rang
es
DC1)
234
140
291
H(Y)
1620
1120
1760
Z(Y) 850
710
1300
UT En
d
day
hr
07
22
10
22
28
21
COLLEGE OBSERVATORY, COLLEGE, ALASKA PRELIMINARY CALIBRATION DATA FOR:
NORMAL MAGKETOGRAPH
COMPONENTPERIOD
FROM TO
CALIBRATION
SCALE VALUE BASELINE
U.T. a~/-ar £.7* /t.e r*
.T, ?L-8-G£~U.T.. A -38 -
Oooo U.T 2 -t-8£U.T.
0000 o.T.
STORM MAGNETOGRAPH
COMPONENT
D
H
Z
PERIOD
FROM
oeooV.T. g-J-BS"
0ooo U.T, JL-/-BJ5'OOOO U-T. 3-9 -B&
Oooo U,T.. %-/-&£*
TO
Jtfoo o.T^ SL -38- eg"
QyooUT, 2--8-8f£*{oo v.T. 2-3.8 -6J5~
MooO.T. &-X8-&S-
CALIBRATION
SCALE VALUE
7.9/Mto ZZft/mM
#3.8 v/mhj//
#&.a y/fftm
BASELINE
;?3* W.'o £C
/0797 */<?77s3 V
&<to9*f y
RAPID RUN MAGNETOGRAPH
COMPONENT
D
H
PERIOD
FROM TO
CALIBRATION
SCALE VALUE
MONTHLY MEAN ABSOLUOE VALUES*
D
£7* V/.7
* COMPUTED FROM TEN
DAYS USED:
/rQUEETEST
F£B
\ H
1 /&30G, * J"^5Vy V.DAYS DURING MONTH.
4 f & /8 /9 &/ 32 £3 3C> 37
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