Ion distributions at the dayside magnetopause

Details Ion distributions at the dayside magnetopause Ion distributions at the dayside magnetopause

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611617s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,617-11,624. Research supported by Southwest Resea

Physics

41

Magnetopause, Magnetospheric Ion Density, Space Plasmas, Ampte (Satellites), Daytime, Solar Wind

Scientific paper

Ion phase space distribution, from the AMPTE UKS ion instrument, for a crossing of the dayside magnetopause on October 2, 1984, during typical southward IMF conditions are presented. D-shaped field-aligned phase space distributions of magnetosheath plasma earthward of and hot magnetospheric ions sunward of the magnetopause current layer are observed. The existence of such D-shaped magnetosheath plasma distributions has been predicted as a signature of reconnection. In addition, the observed ion distributions are in stress balance across the magnetopause, and the de Hoffman-Teller frame velocity obtained from the stress balance calculation is in agreement with the observed distribution function cutoff speed. These new observations thus provide further evidence that, at least for southward IMF conditions, reconnection is an important mechanism by which solar wind plasma penetrates into the magnetosphere.

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