Interaction of field-aligned cold plasma flows with an equatorially-trapped hot plasma - Electrostatic shock formation

Details Interaction of field-aligned cold plasma flows with an equatorially-trapped hot plasma - Electrostatic shock formation Interaction of field-aligned cold plasma flows with an equatorially-trapped hot plasma - Electrostatic shock formation

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..799s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 9, p. 799-802.

Physics

7

Cold Plasmas, Electrostatic Waves, High Temperature Plasmas, Plasma Interactions, Plasmasphere, Shock Waves, Space Plasmas, Computerized Simulation, Equatorial Regions, Free Energy, Ion Distribution, Particle In Cell Technique

Scientific paper

Effects of equatorially trapped hot plasma on the highly supersonic cold-plasma flow occurring during early stage plasmaspheric refilling are studied by means of numerical simulations. It is shown that the equatorially trapped hot ions set up a potential barrier for the cold ion beams and facilitate formation of electrostatic shocks by reflecting them from the equatorial region. Simulations with and without the hot plasma show different flow properties; the formation of electrostatic shocks occur only in the former case. The simulation with the hot plasma also reveals that the magnetic trapping in conjunction with the evolution of the electrostatic potential barrier produces ion velocity distribution functions consisting of a cold core and a hot ring in the perpendicular velocity. Such a distribution function provides a source of free energy for equatorial waves. The corresponding electron population is warm and field-aligned.

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