Energetic ion beams at the edge of the plasma sheet - ISEE 1 observations plus a simple explanatory model

Computer Science – Sound

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Energetic Particles, Geomagnetic Tail, International Sun Earth Explorer 1, Ion Beams, Plasma Layers, Atmospheric Models, Energy Spectra, Particle Motion, Satellite Sounding

Scientific paper

It has been found that energetic ions with energies in the range from 10 keV to 2 MeV are an important part of the geomagnetic tail particle population. A description is presented of energetic ion, three-dimensional distribution observations from ISEE 1 during 0400-2000 UT, May 3, 1978, a time when several encounters with the geomagnetic tail plasma sheet occurred. Pronounced energetic ion streaming is observed at each entry to and exit from the plasma sheet. Azimuthal gradients observed during these times indicate that this streaming occurs within two gyroradii of the plasma sheet edge. Streaming characteristics show both narrow and broad angular flows at arbitrary angles to B. These flows are observed simultaneously and individually. The time, energy, and pitch angle evolution of the ion fluxes show that ISEE 1 is encountering a dynamic and not a static equilibrium situation at the edge of the plasma sheet.

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