Modeling of convection boundaries seen by CRRES in 120-eV to 28-keV particles

Mathematics – Logic

Scientific paper

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Atmospheric Models, Convective Flow, Current Sheets, Earth Magnetosphere, High Temperature Plasmas, Crres (Satellite), Daytime, Particle Motion, Plasma Drift

Scientific paper

We show how often a simple convection model can explain the structure seen in 120-eV to 28-keV particles at the inner boundary of the Earth's plasma sheet. A total of 1346 samples of the boundary were made over a 14-month period using the low-energy plasma analyzer on the Combined Release and Radiation Effects Satellite (CRRES) satellite. The cutoff energy below which enhanced fluxes of electrons are seen during the passage into the boundary increased with L shell; the opposite was observed for ions. Forty to 50 percent of the cutoffs sampled on the nightside of the Earth were consistent with those derived from a convection model with one variable parameter. The model was normally inconsistent with cutoffs measured during increasing activity and with those made on the day side. For consistent cases a correlation of approximately 0.9 was found between the zero energy Alfven layer at midnight and the midnight equatorward boundary measured by the Defense Meteorological Satellite Program (DMSP) satellite.

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