Prognoz 10 energetic particle data: Leakage from the magnetosphere versus bow shock acceleration

Details Prognoz 10 energetic particle data: Leakage from the magnetosphere versus bow shock acceleration Prognoz 10 energetic particle data: Leakage from the magnetosphere versus bow shock acceleration

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9923461k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A12, p. 23,461-23,472

Physics

4

Bow Waves, Electron Flux Density, Energetic Particles, Interplanetary Magnetic Fields, Leakage, Magnetosheath, Particle Acceleration, Shock Waves, Earth Magnetosphere, Geomagnetism, Interplanetary Medium, Plasma Sheaths, Prognoz Satellites, Solar Terrestrial Interactions, Solar Wind, Spectral Energy Distribution

Scientific paper

We present a case study and a statistical survey of Prognoz 10 energetic particle and magnetic field observations from the solar wind to the magnetosphere. The results provide evidence for both Fermi acceleration and leakage from the magnetosphere. Energetic ion (E greater than 15 keV) flux levels upstreams of the bow shock and in the outer magnetosphere generally exceed those in the magnetosheath. Energetic electrons rarely accompany ion fluxes in the outer magnetsheath and upstream of the bow shock, but commonly accompany those in the inner magnetosheath, Upstream flux levels increase as the interplanetary magnetic field (IMF) rotates toward the bow shock normal, consistent with Fermi accleleration. Although the north/south magnetosheath magnetic field orientation has no effect upon energetic particle flux levels in the outer magnetosheath, flux levels in the inner magnetosheath increase during periods of southward IMF. We interpret the results as indicating that Fermi acceleration supplies most of the ions observed in the outer dayside magnetosheath but that leakage from the magnetosphere supplies most of the ions observed in the inner magnetosheath.

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