Other
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96..101v&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Jan. 1, 1991, p. 101-113.
Other
51
Auroral Electrojets, Magnetic Storms, Polar Caps, Equinoxes, Indexes (Ratios), Statistical Correlation
Scientific paper
The value of the newly introduced polar cap (PC) magnetic-activity index as an indicator of auroral electrojet activity is investigated by examining the statistical correlation between the PC and the widely known magnetic activity indices AE, AU, and AL. The PC was derived for two stations, one in the Northern Hemisphere (Thule), the other in the Southern Hemisphere (Vostok), using seven years of PC values for the two stations for the analyses. Results show very high correlation between PC and AE during winter and equinox, with lower correlation during summer. From event studies, it was found that PC is sensitive both to DP-2-type electrojet activity and to substorm intensifications of the westward electrojet in the midnight or postmidnight sector, but less sensitive to substorm intensifications in the westward electrojet in the premidnight sector.
Andresen V. G.
Friis-Christensen Eigil
Troshichev Oleg A.
Vennerstrom Suzanne
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