Initial Survey of Very Energetic Upstream Ions

Details Initial Survey of Very Energetic Upstream Ions Initial Survey of Very Energetic Upstream Ions

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh53b..02w&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH53B-02

Physics

2139 Interplanetary Shocks, 2154 Planetary Bow Shocks, 7807 Charged Particle Motion And Acceleration, 7851 Shock Waves (4455)

Scientific paper

We present initial results from a survey of energetic (0.05--2.0~MeV) gyrating ion distributions seen by the Wind spacecraft in strongly perpendicular regions upstream of interplanetary and Earth's bow shocks. Some of the energetic backstreaming ions are observed within co-rotating interaction regions, or during solar energetic particle events, when there is a sufficient flux of energetic ions to seed production via shock drift acceleration (SDA). Several events, however, occur when there is no evidence of an energetic seed population, and SDA modeling on the ambient population fails to produce the fluxes observed. The later type of events raise new questions about the steps neccesary for producing strongly energized ions starting from an initially cold population.

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