Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29j..79p&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 10, pp. 79-1, CiteID 1437, DOI 10.1029/2001GL014010
Physics
6
Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Energetic Particles, Precipitating
Scientific paper
A two-dimensional numerical two-fluid MHD model of the coupled magnetosphere-ionosphere system has been used to examine the effects of seasonal asymmetry in ionospheric conductance on the development of feedback instability and associated energetic electron precipitation. Effects of finite electron inertia and anomalous resistivity in the magnetospheric MHD model lead to the formation of parallel electric fields above the ionosphere as the feedback instability develops. The Fridman-Lemaire model of energetic electron precipitation has been used to calculate the energy flux carried into the auroral ionosphere by accelerated electrons. The electron energy flux into the lower conductivity winter ionosphere is significantly greater than that into the summer ionosphere due to the asymmetry in ionospheric conductance. The higher energy flux into the winter ionosphere may increase the occurrence of discrete aurora in the winter hemisphere as detected by satellite auroral imaging.
Lotko William
Pokhotelov Dimitri
Streltsov Anatoly V.
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