Characteristics of thermal and suprathermal ions associated with the dayside plasma trough as measured by the dynamics explorer retarding ion mass spectrometer

Physics

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Dynamics Explorer 1 Satellite, Helium Ions, Hydrogen Ions, Magnetic Storms, Magnetohydrodynamic Flow, Plasmasphere, Space Plasmas, Earth Magnetosphere, Field Aligned Currents, Flow Velocity, Ion Density (Concentration), Mass Spectrometers, Plasmapause

Scientific paper

The thermal and suprathermal ion populations present in the refilling regions after a magnetic storm are examined using retarding ion mass spectrometer (RIMS) data from the Dynamics Explorer 1 spacecraft. The RIMS instrument is described, and data are presented and discussed in detail for the outer plasmasphere, plasmapause, depleted dayside magnetosphere, and dayside cusp. Three distinct populations were observed: thermal ions, warm anisotropic plasma, and the polar wind. The characteristics of these populations are considered, including the densities, temperatures, and density ratios. Aspects of the ionospheric plasma outflow are discussed, including the field-aligned flow speed, the ionospheric plasma escape flux, plasmaspheric refilling, and wave-particle phenomena.

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