Polar cap index (PC) as a proxy for ionospheric electric field in the near-pole region

Details Polar cap index (PC) as a proxy for ionospheric electric field in the near-pole region Polar cap index (PC) as a proxy for ionospheric electric field in the near-pole region

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3809t&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 23, p. 3809-3812

Physics

27

Ionosphere: Electric Fields, Ionosphere: Ionosphere/Magnetosphere Interactions, Magnetospheric Physics: Polar Cap Phenomena, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

The ion drift measurements made by a number of DMSP satellites during some intervals in 1991, 1997, and 1998 are utilized for estimation of the ionospheric electric fields over the near-pole region; these estimates are then compared with the Polar Cap (PC) magnetic activity index obtained from ground geomagnetic observations at Qaanaaq (former Thule, Greenland) and Vostok (Antarctica). The analysis shows that the polar cap electric field is primarily controlled by variations in the near-Earth's interplanetary electric field. The relationship between the polar cap ionospheric electric field and the PC-index can be approximated by a quadratic polynomial. The polar cap ionospheric electric field tends to saturate at the asymptote of ~45-50 mV/m when the PC index reaches large positive values (PC>10) the residual electric field (for near-zero interplanetary electric field applied to the Earth's magnetosphere) is ~12 mV/m. It is concluded that the PC-index can serve as a proxy of the ionospheric electric fields in the near-pole region.

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