Pitch angle properties of magnetospheric thermal protons and satellite sheath interference in their observation

Details Pitch angle properties of magnetospheric thermal protons and satellite sheath interference in their observation Pitch angle properties of magnetospheric thermal protons and satellite sheath interference in their observation

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9801s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Nov. 1, 1984, p. 9801-9811. Research supported by the Science and Eng

Physics

11

Earth Magnetosphere, Pitch (Inclination), Proton Energy, Satellite Observation, Angular Distribution, Geos 2 Satellite, Particle Energy, Proton Density (Concentration), Space Plasmas

Scientific paper

The general characteristics of the refilling cold plasma proton pitch angle distribution on flux tubes beyond the plasmasphere at the geomagnetic equator are presented. The pitch angle distribution of protons of about 3 eV or less is highly field-aligned with half width angles between 10 and 20 deg. As the flux tube refills and the isotropic cold proton component increases, the field-aligned component appears to become less field-aligned. No day-night refilling asymmetry is seen. Refilling fluxes continually increase with abrupt density decreases in the 1600-2400 LT sector associated with changes in magnetic storm activity in the magnetosphere. These decreases are predominantly found in the evening sector region, are strongly correlated with magnetic activity, and lie just prior to the 'injection boundary'. The observed pitch angle half widths of 10-20 deg correspond to upper limits on the exospheric source regions of between 9000 and 17,000 km altitude if single particle kinetic motion is applied.

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