Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phflb...1.1519l&link_type=abstract
Physics of Fluids B (ISSN 0899-8221), vol. 1, July 1989, p. 1519-1525.
Physics
14
Earth Ionosphere, Magnetic Dipoles, Plasmasphere, Space Plasmas, Coulomb Collisions, Field Aligned Currents, Plasma Density, Plasma Equilibrium, Thermal Plasmas, Velocity Distribution
Scientific paper
Two extreme models of the rotating ion-exosphere of the earth are described in an attempt to evaluate the importance of Coulomb collisions in exospheric plasma velocity distributions. The first model corresponds to diffusive equilibrium and belongs to the class of hydrodynamic models since it is based on the assumption that the collision frequency is large enough to maintain a Maxwellian and isotropic velocity distribution for particles of all energies. The second type of model considered corresponded to exospheric equilibrium. The refilling process of plasmaspheric flux tubes was qualitatively described in terms of Coulomb pitch angle scattering of ballistic and escaping particles emerging from the topside ionosphere.
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