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.

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COLLEGE OBSERVATORY, COLLEGE, ALASKA PRELIMINARY CALIBRATION DATA FOR:

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