Computer Science
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36.1095t&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 36, Nov. 1988, p. 1095-1102.
Computer Science
83
Annual Variations, Interplanetary Magnetic Fields, Magnetic Anomalies, Polar Caps, Solar Wind, Correlation, Earth Magnetosphere, Perturbation Theory
Scientific paper
A magnetic activity index PC measuring DP2 magnetic pertubations in the central polar cap is derived, and its relationship to various solar wind parameters is investigated through a linear correlation analysis. The PC index is based on data from a single nearpole station, and the index values derived from a station near the south pole, Vostok, are compared with simultaneous index values derived from a station near the north pole, Thule. It is concluded that the index shows a good correlation with the southward component of the interplanetary magnetic field IMF or, even better, the solar wind parameters vB(z) or vB(t) sin-squared Theta/2. In the derivation of the index the following items are taken into account: (1) seasonal changes, (2) inhomogeneity in magnitude and direction of the magnetic perturbation in the nearpole region, and (3) a time delay between variations in the solar wind parameters and the subsequent response in the polar cap.
Andrezen V. G.
Friis-Christensen Eigil
Troshichev Oleg A.
Vennerstrom Suzanne
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