geological survey preliminary geomagnetic data · 2010. 11. 4. · u.s. geological survey 800 yukon...
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UNITED STATES DEPARTMENT OF THE INTERIOR
JULY 1988
GEOLOGICAL SURVEY
PRELIMINARY GEOMAGNETIC DATACOLLEGE OBSERVATORY
FAIRBANKS, ALASKA
OPEN FILE REPORT 88-0300G
BARROW
COLLEGE OBSERVATORY PRELIMINARY .GEOMAGNETIC DATA
EXPLANATION OF DATA AND REPORTS
INTRODUCTION
The preliminary geomagnetic data induced here is made available to scientific personnel and i -ganizations as part of a cooperative effort and on a da^-.a exchange basis because of the early need by som« 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.......+64.6Geomagnetic longitude......+256.5°Elevation..................200 meters
GEOMAGNETIC DATA
Normal and storm magnetograms and appropriate calibration data are processed at the observatory and are nvailable 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 ak 0< 2T~
25<5CX
1CXK 200< 350<
50100200350600
600< 1000 1000< 1650 1650< 2500 2500*
37
15274880
140240400 (10y)
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 SealingsMagnetogram 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 magnetogramB are included. For days when the magnetic field is too disturbed for the Normal magnetogram to be readable, Storm magnetopram 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=B1)-»-d-SD ; H=BH+h-SH : Z=B2+z-Szwhere D, H and Z are absolute values;BJJ, BJJ and BZ are base-lin^ values;Sp, S,, and £7 are scale values;and d, h and z are scalings in millimeters.
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)
NUAA FORM 76-133 °- 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
89
10
11
12
13
14
15
16
1718
19
20
21
2223
24
25
26
27
28
2930
31
to midnight)
K-INDICES
m « «i N o o o «-& A & Ao o o o
3334444312123-2 1 10100
34552335222510001111
34553446321033232213
33462212224521661120
13665445345423232211
2344344-32113111123201343
M «D -
£ * * !«M
.- _ .- (M
42234212322100000121
42213311622000212
1
01
542254220122021532
742342422512101
652564421122112
553421332112012222
12
2 .2211
23222
313312
SUM
2424140705
2621220110
3030111520
3118232407
3136251712
292218111119
OBSERVATORY
College AlaskaMONTH AND YEAR
July 1988
AK
1618070402
2315210004 '
2830050814
4010172903
4040200905
251610050511
TIME SCALE ONMAGNETOGRAMS
20 nun/hr
SUDDEN COMMENCEMENTS
d h m
POSSIBLE SOLAR-FLAREEFFECTS 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......... (ffij 7
CURRENT SCALE VALUE........ 3-70
LOWER LIMIT FOR K - 9 ........ 25GOSCALINGS AND COMPUTATIONS HAVE BEEN CHECKED.
APPROVED
H Z
322.2 ("»»>7.79 (7/mm)
2510 (to nearest 107)
John B. Townshend, Chief, College ObservatoryOBSERVER IN CHARGE
NOAA FORM 76-133 SUPERSEDES C&GS FORM SIS U.S. GOVERNMENT PRINTING OFFIC E: 1873-761 -887
NOAA FOR
M 86
-500
(11/
73)
Data
from
Individual Observatoriess
PRIN
CIPA
L MAGNETIC STORMS
COLLEGE
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ASKA
Ju
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1988
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23 15
COLLEGE GBSERVATOHI, COLLEGE, ALASKA PRELIKIKAOT CALIBRATIOH DATA FOR: July 1988
FORMAL MAGKETOGRAFE
COMPONENT
D
E
Z
PERIOD
FRCM
OOOOUX "7 // /86' / '
( 5cLmeA^
( fi A m A^ '
TO
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CAUBRATICIK
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-7 -7 J /
BASELINE
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STORM MAGHETOGRAPE
COMPONENT
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PERIOD
FROM
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TO
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CALIBRATION
SCALE VALUE
7.9 /mm ^5"^
43.5" VrnrvN
4R~7 ^/ T1 0. / / rw KVN
BASELINE
RAPID RUN MAGNETOGRAPH
COMPONENT
D
E
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PERIOD
FROM TO
CALIBRATION
SCALE VALUE
MOHTHLI MEAN ABSOLUTE VALUES*
D | E Z
<^C7 1 1 . 8 ET / oLo 5 ̂ 5"S 3 O §« COMPUTED FBQU FTVE QUIETEST DAIS DDRIKG ICNTH.
DAIS nsED: CTuLY 4 . S , ^ . IO , 3.O, . :
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