Mathematics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ge%26ae..29...31a&link_type=abstract
Geomagn. Aeron., Vol. 29, No. 1, p. 31 - 35
Mathematics
Earth Ionosphere: Models, Earth Ionosphere: Polar Caps
Scientific paper
Mathematical simulation is used to investigate the response of the ionosphere in the day-cusp and polar-cap regions to the change in time, typical of a substorm, in the position of the precipitation region and of the spectrum of energetic electrons, as well as in the magnitude of the electric field of magnetospheric convection. The ionosphere is regarded as a medium reacting passively to external influences. The variations of the polar peak and of the ionization tongue are analyzed for winter conditions during the successive change of various substorm phases. Changes in the rate of convection of the plasma in the polar cap and of the intensity of precipitations in the day part of the auroral oval lead to increases in electron density by comparison with small latitudinal gradients that drift in the antisolar direction, from the cusp to the pole. The density N(e) within such increases may exceed by one order of magnitude the undisturbed values.
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