Ion signatures of reconnection at the magnetopause

Details Ion signatures of reconnection at the magnetopause Ion signatures of reconnection at the magnetopause

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..19.1947b&link_type=abstract

Advances in Space Research, Volume 19, Issue 12, p. 1947-1950.

Physics

3

Scientific paper

For a rotational MHD discontinuity the bulk flow is Alfvénic in the de Hoffmann-Teller frame. Using AMPTE/IRM data, we present ion distribution functions during three crossings of the dayside low-latitude magnetopause. For these crossings a well defined de Hoffmann-Teller frame can be found, but the field-aligned bulk flow is always slower than the Alfvén speed. Nevertheless, we find signatures in the distribution functions that provide clear evidence for magnetic reconnection: solar wind ions reflected off the magnetopause, ``D-shaped'' solar wind ion distributions in the boundary layer, and counterstreaming of solar wind ions and ionospheric ions in the boundary layer.

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