Thermal protons in the morning magnetosphere - Filling and heating near the equatorial plasmapause

Details Thermal protons in the morning magnetosphere - Filling and heating near the equatorial plasmapause Thermal protons in the morning magnetosphere - Filling and heating near the equatorial plasmapause

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..351w&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, March 1984, p. 351-363. Research supported by the Science and Engineering

Physics

17

Earth Magnetosphere, Equatorial Atmosphere, Plasma Diagnostics, Plasmapause, Space Plasmas, Thermal Plasmas, Geos 1 Satellite, Plasma Heating, Plasma Probes, Protons, Velocity Distribution

Scientific paper

Measurements of the cold-proton velocity distribution near the morning equatorial plasmapause, obtained with the suprathermal plasma analyzers (SPA) on GEOS-1 during a magnetic-storm period on November 25-30, 1977, are reported and analyzed. The SPA instruments, data acquisition, and analysis techniques are explained, and the results are presented graphically. A 0.5-1.5-eV plasmapause interaction region, where the scattering and heating of ionospheric protons is maximized, is found to lie earthward of the conventional 10/cu cm density threshold, and to have a width which is strongly dependent on magnetic activity. The latter effect is studied in direct measurements of magnetospheric E x B drift, and scattering and acceleration along the flux tubes are investigated: for the late-morning data set considered, flux-tube potential drops do not exceed 1 volt, and pitch-angle scattering in the ionospheric-proton source cone continues up to 40 or even 70 deg.

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