Observations of warm plasma in the dayside plasma trough at geosynchronous orbit

Details Observations of warm plasma in the dayside plasma trough at geosynchronous orbit Observations of warm plasma in the dayside plasma trough at geosynchronous orbit

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.7075h&link_type=abstract

Journal of Geophysical Research, vol. 84, Dec. 1, 1979, p. 7075-7090.

Physics

8

High Temperature Plasmas, Plasmasphere, Positive Ions, Satellite Observation, Ats 6, Convective Flow, Geosynchronous Orbits, Pitch (Inclination), Plasma Density

Scientific paper

Positive ions in the energy range E = 3-50 eV have been measured on the dayside at geosynchronous orbit with the University of California at San Diego auroral particles experiment on ATS 6. It is found that the near-equatorial plasma trough contains a warm plasma component with a relatively stable temperature 11 eV and a low 'isotropic component' of density typically in the range 0.1-0.4 ion/cc. The pitch angle distributions of these warm ions are typically field-aligned, indicating an ionospheric origin, and have pitch angle half widths in the range 20-40 deg. Pancake and conical distributions are also observed. Abrupt enhancements of the plasma density to 1-10 ions/cc, or more, are seen in the late afternoon and last from several minutes to a few hours.

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