Energetic plasma ions within the earth's magnetosheath

Details Energetic plasma ions within the earth's magnetosheath Energetic plasma ions within the earth's magnetosheath

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..953a&link_type=abstract

Geophysical Research Letters, vol. 5, Nov. 1978, p. 953-955. Research sponsored by the U.S. Department of Energy; Bundesministe

Physics

3

Ion Motion, Magnetohydrodynamic Flow, Magnetosheath, Magnetospheric Instability, Shock Wave Propagation, Solar Wind, Bow Waves, International Sun Earth Explorers, Plasma Spectra, Plasma-Particle Interactions

Scientific paper

Observations in the dawn magnetosheath with the LASL/MPI fast plasma experiment on ISEE 1 and 2 reveal the existence of two distinct states of plasma flow within the sheath: a quiet state and a disturbed state. Energetic ions in the range of 3-40 keV are the distinguishing feature of the disturbed state. Long period (about 1 min) fluctuations in plasma density, temperature, flow speed, and flow direction occur simultaneously with the appearance of these high-energy particles. The most likely explanation of these observations is that the energetic ions are produced in the vicinity of the bow shock under certain (unspecified) interplanetary conditions, and that the fluctuations in plasma flow are produced locally by the interaction of the energetic ions with the ambient plasma.

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