Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29..469l&link_type=abstract
(European Geophysical Society, Meeting, 7th, Budapesti Muszaki Egyetem, Budapest, Hungary, Aug. 25-29, 1980.) Planetary and Spac
Physics
9
Earth Magnetosphere, Magnetohydrodynamic Flow, Plasma Density, Plasma Drift, Plasmapause, Space Plasmas, Cold Plasmas, Equatorial Atmosphere, Flow Velocity, Gas Injection, Gravitational Effects, Inertia, Magnetic Storms, Particle Motion, Plasma Conductivity
Scientific paper
McIlwain's (1972, 1974) electric and magnetic field distributions are used to calculate the drift path of plasma density irregularities, taking into account plasma interchange motion driven by the gravitational and inertial forces acting on the whole mass of the plasma elements. It is shown that a region exists in the magnetosphere that is unstable with respect to the interchange motion of the cold plasma element. Any plasma hole in the background density ultimately drifts toward an asymptotic trajectory. The inward gravitational force along this trajectory is balanced by the outward inertial force averaged over one revolution around the earth. This asymptotic trajectory, along which all plasma holes eventually accumulate, is identified with the equatorial plasmapause. The maximum velocity for the interchange motion is shown to be proportional to the excess (or defect) of density in the plasma element and inversely proportional to the integrated Pedersen conductivity. It is also shown that plasma detachment occurs preferentially in the post-midnight sector.
Kowalkowski L.
Lemaire Joseph
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