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$Page 1: PRELIMINARY GEOMAGNETIC DATA - USGS · OOQDU.T. v MJ C,///88 »-y /r vScLmeA ' ( v S0LVY\e^\y,3400 U.X 6 1/*n/Pft f6^m^) ' f^G^^VJ ; CALLBRATIOK SCALE VALUE / n'X ^T ^ / 7 gn'/ ^$
UNITED STATES DEPARTMENT OF THE INTERIOR

JUNE 1988

GEOLOGICAL SURVEY

PRELIMINARY GEOMAGNETIC DATACOLLEGE OBSERVATORY

FAIRBANKS, ALASKA

OPEN FILE REPORT 88-0300F

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: R,V, 0 CONNELL AND L,Y, TORRENCE 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

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 too disturbed to read)

COLLEGE OBSERVATORY PRELIMINARY GEOMAGNETIC DATA

EXPLANATION OF DATA AND REPORTS

INTRODUCTION

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 bards 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 ObservatoryU.S. Geological Survey800 Yukon DriveFairbanks, Alaska 99775-5160

Requests for copies of the magnetograms except for the current month should be addressed to:

World Data Center A NOAA D63m 325 Broadway Boulder, Colorado 80303

OBSERVATORY LOCATION

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 latitute........64° 51.6'NGeographic longitude.......147° 50.2'WGeomagnetic latitude.......+64.6°Geomagnetic longitude......+256.5°Elevation..................200 meters

GEOMAGNETIC DATA

Normal and storm magnetograms and appropriate calibration data are processed at the observatory and are available for analysis or copying. Also available are mean hourly scalings for the five quietest days for the month and K-Indices.

Magnetic Activity

The 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 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 a accuracy not justified.

The schedule for converting gamma range to K, and "K to ak is as follows:

Gamma Range K - Index

25< 50<

10CX 200< 350< 600< 1000

1000< 1650 1650< 2500 2500+

50100200350600

ak~tf

3 7

15274880

140 240 400 (lOy)

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 averaged 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 sheet 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 one is interested in the detailed morphology of the magnetic field, 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=BD+d-SD; H=BH+h-SH ; Z=BZ+Z-SZwhere D, H and Z are absolute values;Bp, Br, and B^ are base-linp values;Sp, Su and Sg are scale values;and d, h and z are scalings in millimeters.

*u»AFORM74 133 U. S. DEPARTMENT OF COMMERCE (9-72) /°- | *» NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

MAGNETIC ACTIVITY(Greenwich civil time, counted from midnight to midnight)

DATE

1

2

3

4

5

6

7

89

10

11

12

13

14

15

16

1718

19

20

21

2223

24

25

26

27

28

2930

K-INDICES

m u? £ CM o o o -i A i &0000

11131202000000001100

44100232232400103432

23321111321045442221

2322

34443222 33365354

11142344232235213454

22343312133615535442

in co - «».- CM CM

A J> A.- CM

10211011000001103232

01111111211133220211

23101000100153330122

311142125432 45323211

41125211211255324 5 3 3

33441 2 3. 132225444666 3

SUM

1008000212

1211161116

1605083112

152423 2924

152215

2631

2516223136

OBSERVATORY

College AlaskaMONTH AND YEAR

June 1988

AK

0503000106

0805090610

0902042805

081817 2821

1017072428

1808193046

TIME SCALE ONMAGNETOGRAMS

20 nun/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 s 9. ........ AT rj

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vx / X 1

3.70LOWER LIMIT FOR K = 9 ........ 2500

SCALINGS AND COMPUTATIONS HAVE BEEN CHECKED.

APPROVED

H Z

322.2 fmm ^

7.79 (7/mm)

2510 (to nearest 107)

John B. Townshend, Chief, College ObservatoryOBSERVER IN CHARGE

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