UNITED STATES DEPARTMENT OF THE INTERIOR

OCTOBER 1989

GEOLOGICAL SURVEY

PRELIMINARY GEOMAGNETIC DATACOLLEGE OBSERVATORY

FAIRBANKS, ALASKA

OPEN FILE REPORT 89-0300J

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. O'CONNELL AND CAROL ANN VARNER AND IN COOPERATION WITH THE GEOPHYSICAL INSTITUTE OF THE UNIVERSITY OF ALASKA FAIRBANKS. 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 K.agnetograms (When Normal is too disturbed to read)

COLLEGE OBSERVATORY PRELIMINARY GEOMAGNETIC DATA

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 basis because of the early need by some

users. 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 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

geomagnetism and seismology, it cooperates with the

other scientists and organizations in areas where the

facility 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

EXPLANATION OF DATA & REPORTS

Available Data & Reports

Normal and storm magnetograms and appropriate

calibration data are processed at the observatory and

are available for analysis or copying. Magnetic

Activity Report (K-Indices & AK values), Principal

Magnetic Storms Report, and Magnetogram Hourly

Scalings for the five quietest days of the month are

also available.

Magnetic Activity

The K-Index: The K-Index is a logarithmic

measurement 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 Ecruivalent 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 107 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 Range0< 25

25< 5050< 100

100< 200200< 350350< 600600< 1000

1000< 16501650< 25002500+

K-Index0123456789

ak037

15274880

140240400 (107 )

Principal Magnetic Storms

Gradual and sudden commencement magnetic

disturbances 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 commencement; 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 Scalings

Magnetogram 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 magnetogram. Magnetograms

The normal magnetograms in this report are reproduced 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 Values

To 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 ;where D, H and Z are absolute values;B Bu and B n are base-line values;S_, SH and S_ are scale values;

and d, h and z are scalings in millimeters.

NOAA FORM 76.133 U> S< DEPARTMENT OF COMMERCE (9-72) /°-'*3 NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

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