Anisotropies of 35-56 keV ions associated with interplanetary shocks

Details Anisotropies of 35-56 keV ions associated with interplanetary shocks Anisotropies of 35-56 keV ions associated with interplanetary shocks

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc....3..156s&link_type=abstract

International Cosmic Ray Conference, 18th, Bangalore, India, Aug. 22-Sept. 3, 1983, Paper. 4 p.

Physics

Anisotropy, Interplanetary Medium, Shock Wave Interaction, Space Plasmas, Field Aligned Currents, International Sun Earth Explorer 3, Plasma Acceleration, Solar Wind

Scientific paper

Preliminary results of a survey of about 40 interplanetary shocks observed on ISEE-3, using 35-56-keV 3-dimensional proton-anisotropy parameters, are presented. Upstream anisotropies in the solar wind frame are generally field aligned, with flow away from the shock, whereas downstream anisotropies vary from moderate field-aligned anisotropies with flow away from the shock to isotropy. The largest anisotropies are associated with perpendicular shocks. An intensity enhancement at about 90-deg pitch angles is observed in association with perpendicular shocks. These results are interpreted as evidence for Fermi acceleration associated with quasi-parallel shocks and an electric-field drift acceleration with quasi-perpendicular shocks.

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