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Fig. 4.8 Electric field potential distributions in polar geomagnetic coordinates at latitudes higher
than 60 ı (Northern Hemisphere) calculated using the UAM model at various universal time
(UT) moments (06, 12, 18, and 24 UT) on 28 October 2003. The simulation run uses solar and
geomagnetic input parameters (partly shown in Fig. 4.7 ) and the parametrized FAC pattern of
Papitashvili et al. ( 2002 )(cf.Fig. 4.5 )
auroral and polar regions and hence of the ionospheric conductivity. Lukianova
and Christiansen ( 2008 ) found a rather complicated dependence of the convection
patterns on the combination of UT and IMF clock-angle variation.
Finally, to estimate the degree of quantitative agreement between model cal-
culations and the CHAMP satellite observations, we compared the respective
thermospheric cross-track wind components during particular polar region crossings
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