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Description:"The first series of PD index values were published by WDC B in Moscow (see Troshichev et al., 1991), for the years 1975-1982. Here we present a reprint of this data series, together with a continuation for he years 1983-1993. PC is an index for magnetic activity int he (P)olar (C)ap. It is based on data from a single nearpole station, and is aimed to monitor the polar cap magnetic activity. This activity is 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, placed in the village Qaanaaq in Greenland at 86.5° geomagnetic invariant latitude, fulfills the requirement of being close to the magnetic pole in the northern hemisphere. The station Vostok at 83.3° 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 Andresen (1985), Vennerstrøm and Friis-Christensen (1987), Troshichev et al. (1988), Vennerstrøm (1990), Vennerstrøm et al. (1991).
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Content Notes:by S. Vennerstrøm, E. Friis-Christensen, O.A. Troshichev, and V.G. Andresen.
At head of title: World Data Center A for Solar-Terrestrial Physics.
"April 1994."
Also available online in PDF format.
Includes bibliographical references (page 8).
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