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GEOMAGNETIC POLAR CAP (PC) INDEX


The PC-index is a fifteen-minute index for magnetic activity in the (P)olar
(C)ap. It is based on data from a single nearpolar station, and aimed to
monitor the polar cap magnetic activity generated by such solar wind
parameters as the southward component of the interplanetary magnetic field
(IMF), the azimuthal component of the IMF (By), and the solar wind velocity
(v). The station Thule, located in the village Qaanaaq in Greenland at 86.5
degrees geomagnetic invariant latitude, fulfills the requirement of being
close to the magnetic pole in the northern hemisphere. The station Vostok
at 83.3 degrees does the same in the southern hemisphere. The PC index is
derived independently for these two stations.

The PC-index is based on an idea by Troshichev et al. (1979) and developed
in papers by Troshichev and Andrezen (1985), Vennerstrom and Friis-Christensen
(1989), Troshichev et al. (1988), Vennerstrom (1991), and Vennerstrom et al.
(1991). Earlier data for 1975-1982 appear in Troshichev et al. (1991). The
data from 1975 to 1993 are published in Report UAG-103 in graphical form.
These data are published monthly in the SGD.

Data are present for the following years:
Thule: 1975-CURRENT: Files are monthly, zipped in an annual file.
Vostok: 1978-1979, 1983-1991: Files are annual, zipped in an annual file.

To extract the files, type: 'pkunzip '


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Data Format:

1- 3 A3 Station 3-letter code (THL=Thule, VOS=Vostok)
4- 5 I2 Year (78)
6- 7 I2 Month (01)
8 A1 Element (P)
9- 10 I2 Day (01)
11- 14 A4 Data type (FIN=Final, PREL=Preliminary)
15- 16 I2 20 for leading 2-digits of the year, after 1999
17- 24 10X Blank
25-600 96(F6.1) 96 15-minute values = 24 hours
No data = 9999.0