Magnetospheric convection effects at mid-latitudes. III - Theoretical derivation of the disturbance convection pattern in the plasmasphere

Details Magnetospheric convection effects at mid-latitudes. III - Theoretical derivation of the disturbance convection pattern in the plasmasphere Magnetospheric convection effects at mid-latitudes. III - Theoretical derivation of the disturbance convection pattern in the plasmasphere

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..235b&link_type=abstract

Journal of Geophysical Research, vol. 88, Jan. 1, 1982, p. 235-251.

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38

Convection, Earth Magnetosphere, Ionospheric Drift, Midlatitude Atmosphere, Solar Terrestrial Interactions, Space Plasmas, Ionospheric Currents, Magnetohydrodynamic Flow, Time Dependence

Scientific paper

The generating mechanisms of the disturbance E x B drifts observed at midlatitudes are investigated theoretically in the hope of understanding the local time dependence of the average disturbance drifts observed above Saint-Santin (L equals 1.8, 47 geomagnetic latitude) and of extending it to other latitudes. To this end, the middle- and low-latitude effects of the two possible generators of electric field disturbances, namely the solar wind/magnetosphere dynamo and the ionospheric wind disturbance dynamo, computed with a numerical dynamo model of the ionosphere, are systematically compared with the Saint-Santin disturbance drift pattern. The solar wind/magnetosphere dynamo is simulated as an electrostatic potential generator at 75 deg latitude, and its local time dependence is determined by a least squares fitting of the drifts calculated at 45 deg latitude to the observed drift pattern. When only the solar wind/magnetosphere dynamo is considered, the best fit is found for a diurnal sinusoidal shape of the 75 deg latitude potential corresponding to a 40 kV total potential drop across the polar cap rotated by 2 hours eastward from the dawn-dusk direction.

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