Anisotropies and flows of suprathermal particles in the distant magnetotail - ISEE 3 observations

Details Anisotropies and flows of suprathermal particles in the distant magnetotail - ISEE 3 observations Anisotropies and flows of suprathermal particles in the distant magnetotail - ISEE 3 observations

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10.1203s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, Dec. 1983, p. 1203-1206. Sponsorship: Bundesministerium für Forschung un

Physics

16

Anisotropy, Geomagnetic Tail, International Sun Earth Explorer 3, Proton Flux Density, Space Plasmas, Electron Density (Concentration), Plasma Density

Scientific paper

The ISEE-3 spacecraft has been transferred in 1982 into an earth orbit which brings the satellite close to the tailward Lagrangian point L2 at about 220 R(E) and thus allows exploration of the distant geomagnetic tail. An initial analysis of energetic proton measurements greater than 30 keV from the Max-Planck-Institut/University of Maryland sensor system on ISEE-3 is reported. It has been found that suprathermal protons are a persistent feature of the distant tail. Differential intensitites at 30 keV are essentially constant between the lunar distance and 220 R(E) and about one order of magnitude smaller than in the near earth, or greater than about 20 R(E), plasma sheet. Assuming that these protons are convected with the local plasma flow, it is possible to derive plasma velocities. During time periods where a comparison is possible, these velocities compare favourably well with the velocities derived from the Los Alamos National Laboratory plasma analyzer on board the same spacecraft. The appearance of the plasma sheet, as evidenced by the suprathermal particles, is rather bursty. Anisotropies are large, and predominantly tailward.

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