Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52b..01m&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH52B-01
Physics
2139 Interplanetary Shocks, 7514 Energetic Particles (2114), 7807 Charged Particle Motion And Acceleration, 7811 Discontinuities
Scientific paper
We report on gyrophase-restricted ion beams up to energies of 2 MeV seen by Wind in the Earth's distant foreshock (~65~R{ E}). These distributions are characterized by unexpected properties: they retain phase coherence over many gyroperiods of travel and in the absence of waves with sufficient power to trap them; the observed gyrophases are nearly constant in spite of variations in the estimated shock distance that are several gyroradii in scale; and they often have two peaks ~180° apart in gyrophase. The dispersion observed in particles of differing energies, and good agreement with model calculations suggest that these were likely produced by the shock drift acceleration of a pre-existing energetic seed population. The emergence of two-sided distributions at lower computed θ B {n} values is consistent with the remote sensing of a thin ion foreshock layer. In this instance, gaps in gyrophase distributions would indicate incident directions for particles that have their guiding centers situated outside of the foreshock layer.
Lin Robert P.
Meziane Karim
Parks George K.
Wilber M. M.
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