Direct evidence for two-stage (bimodal) acceleration of ionospheric ions

Computer Science – Sound

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Auroral Zones, Ionospheric Ion Density, Ionospheric Sounding, Particle Acceleration, Upper Ionosphere, Dynamics Explorer 1 Satellite, Energetic Particles, Energy Spectra, Ion Distribution, Ion Injection, Ion Temperature, Ionospheric Heating, Magnetospheric Ion Density, Oxygen Ions

Scientific paper

Energetic ion composition spectrometer data gathered on hybrid conical ion distributions by the Dynamics Explorer 1 in the topside ionosphere are reported. The observed ion distributions were field-aligned and upward flowing, with energies up to 5 keV. Increases in ion energy were accompanied by a departure from field-alignment and a cone patterned upward flow, with the apex in the auroral field lines and the cone angle widening upward as the energy increased. Both transverse and parallel accelerations were imparted to the ions, with the transverse heating occurring in a 5000 km extent region centered at 18,000 km altitude. A bi-Maxwellian distribution, a temperature of 1.2 keV and a 260 eV parallel temperature were found at the top of the region.

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