Persistent pressure anisotropy in the subsonic magnetosheath region

Details Persistent pressure anisotropy in the subsonic magnetosheath region Persistent pressure anisotropy in the subsonic magnetosheath region

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3...65c&link_type=abstract

Geophysical Research Letters, vol. 3, Feb. 1976, p. 65-68.

Physics

3

Anisotropic Media, Earth Magnetosphere, Magnetosheath, Plasma Sheaths, Pressure Distribution, Explorer 33 Satellite, Magnetohydrodynamic Flow, Plasma Diagnostics, Proton Flux Density, Subsonic Flow, Time Response

Scientific paper

Observations of proton fluxes in the subsonic flow region of the magnetosheath show double peaks as a function of angle in the equatorial plane of the spacecraft. The peaks are separated by a wide angle, usually more than 90 deg. Suggestions of double flux peaks are present in 95 per cent of the data. They are interpreted as the effect of a persistent pressure anisotropy. The clearest cases were analyzed to determine the orientation of the flux peaks relative to the magnetic field and direction of a model hydrodynamic flow. The peaks are shown to be consistent with a greater pressure perpendicular to the field. Possible sources of the pressure anisotropy in the magnetosheath are discussed.

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