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The National Geophysical Data Center provides the observations here with no re-
strictions on their use. Please contact us at the address below with your com-
ments and questions about the form and the content of this information product
or about the measurements themselves.

NATIONAL GEOPHYSICAL DATA CENTER
325 Broadway Mail Code E/GC2
Boulder, Colorado 80303-3328 USA

Telephone: (303) 497-6135 Telex: 592811 NOAA MASC BDR
FAX: (303) 497-6513


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SELECTED GEOMAGNETIC AND SOLAR ACTIVITY INDICES
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WORLDWIDE INDICES--------------------------------------------------------------
The subscript "p" means planetary and designates a global magnetic activity in-
dex. The following 13 observatories, which lie between 46 and 63 degrees north
and south geomagnetic latitude, now contribute to the planetary indices: Ler-
wick (UK), Eskdalemuir (UK), Hartland (UK), Ottawa (Canada), Fredericksburg
(USA), Meannook (Canada), Sitka (USA), Eyrewell (New Zealand), Canberra (Aus-
tralia), Lovo (Sweden), Brorfelde (Denmark), Wingst (Germany), and Niemegk
(Germany).


THREE-HOUR-RANGE INDEX K-------------------------------------------------------
K indices isolate solar particle effects on the earth's magnetic field; over a
3-hour period, they classify into disturbance levels the range of variation of
the more unsettled horizontal field component. Each activity level relates al-
most logarithmically to its corresponding disturbance amplitude. Three-hour
indices discriminate conservatively between true magnetic field perturbations
and the quiet-day variations produced by ionospheric currents.

K indices range in 28 steps from 0 (quiet) to 9 (greatly disturbed) with frac-
tional parts expressed in thirds of a unit. A K-value equal to 27, for exam-
ple, means 2 and 2/3 or 3-; a K-value equal to 30 means 3 and 0/3 or 3 exactly;
and a K-value equal to 33 means 3 and 1/3 or 3+. The arithmetic mean of the K
values scaled at the 13 observatories listed above gives Kp.


EQUIVALENT AMPLITUDE-----------------------------------------------------------
The a-index ranges from 0 to 400 and represents a K-value converted to a linear
scale in gammas (nanoTeslas)--a scale that measures equivalent disturbance am-
plitude of a station at which K=9 has a lower limit of 400 gammas.



FORMAT FOR RECORDS OF SELECTED GEOMAGNETIC AND SOLAR ACTIVITY INDICES
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COLUMNS FMT DESCRIPTION
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1- 2 I2 YEAR
3- 4 I2 MONTH
5- 6 I2 DAY

7-10 I4 BARTELS SOLAR ROTATION NUMBER--a sequence of 27-day intervals
counted continuously from February 8, 1832.
11-12 I2 NUMBER OF DAY within the Bartels 27-day cycle.

13-14 I2 Kp or PLANETARY 3-HOUR RANGE INDEX for 0000 - 0300 UT.
15-16 I2 Kp or PLANETARY 3-HOUR RANGE INDEX for 0300 - 0600 UT.
17-18 I2 Kp or PLANETARY 3-HOUR RANGE INDEX for 0600 - 0900 UT.
19-20 I2 Kp or PLANETARY 3-HOUR RANGE INDEX for 0900 - 1200 UT.
21-22 I2 Kp or PLANETARY 3-HOUR RANGE INDEX for 1200 - 1500 UT.
23-24 I2 Kp or PLANETARY 3-HOUR RANGE INDEX for 1500 - 1800 UT.
25-26 I2 Kp or PLANETARY 3-HOUR RANGE INDEX for 1800 - 2100 UT.
27-28 I2 Kp or PLANETARY 3-HOUR RANGE INDEX for 2100 - 2400 UT.
29-31 I3 SUM of the eight Kp indices for the day expressed to the near-
est third of a unit.

32-34 I3 ap or PLANETARY EQUIVALENT AMPLITUDE for 0000 - 0300 UT.
35-37 I3 ap or PLANETARY EQUIVALENT AMPLITUDE for 0300 - 0600 UT.
38-40 I3 ap or PLANETARY EQUIVALENT AMPLITUDE for 0600 - 0900 UT.
41-43 I3 ap or PLANETARY EQUIVALENT AMPLITUDE for 0900 - 1200 UT.
44-46 I3 ap or PLANETARY EQUIVALENT AMPLITUDE for 1200 - 1500 UT.
47-49 I3 ap or PLANETARY EQUIVALENT AMPLITUDE for 1500 - 1800 UT.
50-52 I3 ap or PLANETARY EQUIVALENT AMPLITUDE for 1800 - 2100 UT.
53-55 I3 ap or PLANETARY EQUIVALENT AMPLITUDE for 2100 - 2400 UT.
56-58 I3 Ap or PLANETARY EQUIVALENT DAILY AMPLITUDE--the arithmetic mean
of the day's eight ap values.

59-61 F3.1 Cp or PLANETARY DAILY CHARACTER FIGURE--a qualitative estimate
of overall level of magnetic activity for the day determined
from the sum of the eight ap amplitudes. Cp ranges, in steps
of one-tenth, from 0 (quiet) to 2.5 (highly disturbed).

62-62 I1 C9--a conversion of the 0-to-2.5 range of the Cp index to one
digit between 0 and 9.

63-65 I3 INTERNATIONAL SUNSPOT NUMBER. Records contain the Zurich num-
ber through December 31, 1980, and the International Brus-
sels number thereafter.

66-70 F5.1 OTTAWA 10.7-CM SOLAR RADIO FLUX ADJUSTED TO 1 AU--measured at
1700 UT daily and expressed in units of 10 to the -22 Watts/
meter sq/hertz. Observations began on February 14, 1947.
From that date through December 31, 1973, the fluxes given
here don't reflect the revisions Ottawa made in 1966. NOTE:
If a solar radio burst is in progress during the observation
the pre-noon or afternoon value is used (as indicated by a
flux qualifier value of 1 in column 71.

71-71 I1 FLUX QUALIFIER. "0" indicates flux required no adjustment;
"1" indicates flux required adjustment for burst in progress
at time of measurement; "2" indicates a flux approximated by
either interpolation or extrapolation; and "3" indicates no
observation.
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