ISEE observations of low frequency waves and ion distribution function evolution in the plasma sheet boundary layer

Details ISEE observations of low frequency waves and ion distribution function evolution in the plasma sheet boundary layer ISEE observations of low frequency waves and ion distribution function evolution in the plasma sheet boundary layer

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.2023e&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Oct. 1990, p. 2023-2026. Research supported by the University of Califor

Physics

13

Boundary Layer Plasmas, Geomagnetic Tail, International Sun Earth Explorers, Ion Distribution, Low Frequencies, Plasma Layers, Dense Plasmas, Ion Beams, Ions, Magnetic Variations, Solar Terrestrial Interactions

Scientific paper

This paper describes ISEE plasma and magnetic fluctuation observations during two crossings of the plasma sheet boundary layer (PSBL) in the earth's magnetotail. Distribution function observations show that the counterstreaming ion components undergo pitch-angle scattering and evolve into a shell distribution in velocity space. This evolution is correlated with the development of low frequency, low amplitude magnetic fluctuations. However, the measured wave amplitudes are insufficient to accomplish the observed degree of ion pitch-angle scatttering locally; the near-earth distributions may be the result of processes occurring much farther down the magnetotail. Results show a clear correlation between the ion component beta and the relative streaming speed of the two components, suggesting that electromagnetic ion/ion instabilities do play an important role in the scattering of PSBL ions.

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