The polar cap magnetic activity indices in the southern (PCS) and northern (PCN) polar caps: Consistency and discrepancy

Details The polar cap magnetic activity indices in the southern (PCS) and northern (PCN) polar caps: Consistency and discrepancy The polar cap magnetic activity indices in the southern (PCS) and northern (PCN) polar caps: Consistency and discrepancy

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29r..26l&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 18, pp. 26-1, CiteID 1879, DOI 10.1029/2002GL015179

Physics

9

Magnetospheric Physics: Polar Cap Phenomena, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Ionosphere: Polar Cap Ionosphere, Magnetospheric Physics: Plasma Convection

Scientific paper

There are some systematic differences between the 1-min Polar Cap (PC) indices of magnetic activity derived from data from the southern hemispheric station, Vostok, and the northern hemispheric station, Thule. First of all, differences in sign of the PC index are observed when BZ is northward: negative values of the PC index are common in the summer polar cap. Secondly, predominance of larger PC index values is seen in winter hemisphere for extremely high levels of magnetic activity (PC > 12) when the ionospheric electric field in summer and winter polar caps tends to approach an asymptotic value of E = 40-45 mV/m. It is suggested that ionospheric conductivity in the winter polar cap can be significantly increased owing to bombardment of the ionosphere by solar protons (E = 1-10 MeV) in association with polar cap absorption events.

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