Hot flow anomaly formation by magnetic deflection

Details Hot flow anomaly formation by magnetic deflection Hot flow anomaly formation by magnetic deflection

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1621o&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, Sept. 1990, p. 1621-1624. Research supported by DOE and Los Alamos Natio

Physics

9

Bow Waves, Magnetosheath, Shock Waves, Solar Wind, Space Plasmas, Computerized Simulation, Ion Beams, Magnetic Anomalies, Magnetospheric Ion Density

Scientific paper

Hot flow anomalies (HFAs) are localized plasma structures observed in the solar wind and magnetosheath near the earth's quasi-parallel bow shock. This paper presents one-dimensional hybrid computer simulations illustrating a formation mechanism for HFAs in which the single hot ion population results from a spatial separation of two counterstreaming ion beams. The higher-density cooler regions are dominated by the background (solar wind) ions, and the lower-density hotter internal regions are dominated by the beam ions. The spatial separation of the beam and background is caused by the deflection of the ions in large-amplitude magnetic fields which are generated by ion/ion streaming instabilities.

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