Characteristics of suprathermal H(+) and He(++) in plasmoids in the distant magnetotail

Details Characteristics of suprathermal H(+) and He(++) in plasmoids in the distant magnetotail Characteristics of suprathermal H(+) and He(++) in plasmoids in the distant magnetotail

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11.1030g&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, Oct. 1984, p. 1030-1033. Sponsorship: Bundesministerium für Forschung un

Physics

22

Geomagnetic Tail, Helium Ions, Hydrogen Ions, Positive Ions, Space Plasmas, Distribution Functions, Energetic Particles, Ion Density (Concentration), Plasma Probes, Proton Energy

Scientific paper

Rest frame distribution functions were obtained for suprathermal H(+) and He(2+) ions during 20 particle intensity increases that were observed in the distant magnetotail by ISEE-3. All of these increases were characterized by isotropic, approximately 100-keV electrons, preceded by beaming electrons and velocity-dispersed protons distributions whose signatures are typically associated with plasmoids. In each of the plasmoids, both H(+) and He(2+) are found to be convected tailward, with speeds that range from 200 to 1000 km/sec. The acceleration mechanism is found to depend on particle velocity, and it is established that the solar wind is a dominant plasma source. The plasmoids appear to be expanding at about 100 km/sec during their tailward propagation.

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