He(2+) and H(+) dynamics in the subsolar magnetosheath and plasma depletion layer

Details He(2+) and H(+) dynamics in the subsolar magnetosheath and plasma depletion layer He(2+) and H(+) dynamics in the subsolar magnetosheath and plasma depletion layer

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9621095f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Dec. 1, 1991, p. 21,095-21,104. Research supported by SERC, NSF, NASA

Statistics

Methodology

40

Helium Ions, Hydrogen Ions, Magnetosheath, Plasma Acceleration, Plasma Layers, Magnetopause, Plasma Diagnostics, Polar Regions, Satellite Observation, Solar Wind

Scientific paper

A magnetosheath interval monitored by a pair of close upstream spacecraft is analyzed. Composition measurements are used to determine separately many of the properties of H(+) and He(2+) in the magnetosheath, plasma depletion layer, and accelerated flow layer. Magnetosheath ion densities and density ratios are well correlated with those in the upstream and on average the He(2+)/H(+) temperature ratio remains constant across the shock. Temperatures decrease and anisotropies increase as the magnetosheath plasma is lost parallel to the magnetic field in the depletion layer. Compared to the magnetosheath, there is a 20-30-percent enhancement in the depletion layer He(2+)/H(+) density ratio and an enhancement in the depletion layer temperature ratio. By monitoring upstream conditions, a methodology is developed for studying the plasma depletion layer and magnetosheath separately.

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