Relationship between the ionospheric potential and the ground-level electric field in the southern polar cap

Details Relationship between the ionospheric potential and the ground-level electric field in the southern polar cap Relationship between the ionospheric potential and the ground-level electric field in the southern polar cap

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ge%26ae..51..383l&link_type=abstract

Geomagnetism and Aeronomy, Volume 51, Issue 3, pp.383-393

Computer Science

Scientific paper

The relationships between the average hourly values of the vertical ground-level electric field measured at the Vostok Antarctic station and the ionospheric potential above the station have been obtained. The Δ Ez and Uext parts of both parameters controlled by the solar wind were considered. Convection models (Weimer, 1995; Lukianova and Christiansen, 2006) and a model based on the SuperDARN radar system were used to determine the ionospheric potential. An analysis has been performed for isolated days and the entire sample in 1998-2000 (including 170 days of "fine weather"). For an isolated day, the best correlation coefficients ( R) between Δ Ez and Uext obtained using the three models were 0.81, 0.80, and 0.88, respectively. The total correlation coefficient for the entire data set was R = 0.24-0.32. The R value was larger during daytime ( R ≈ 0.4) and smaller at night ( R ≈ 0.1) and slightly increased in the early morning hours. The specific features of daily variations in R apparently indicate that it is possible to adequately describe the structure of the ionospheric electric field equipotentials by using large-scale stationary convection models. The R value varies complexly, depending on the IMF orientation, but it generally tends to increase from IMF By < 0 to By > 0, which is explained by the asymmetric convection patterns for opposite By signs.

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