Acceleration of energetic ions at the earth's near perpendicular shock: Three-dimensional observations

Details Acceleration of energetic ions at the earth's near perpendicular shock: Three-dimensional observations Acceleration of energetic ions at the earth's near perpendicular shock: Three-dimensional observations

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..528..282m&link_type=abstract

ACCELERATION AND TRANSPORT OF ENERGETIC PARTICLES OBSERVED IN THE HELIOSPHERE: ACE 2000 Symposium. AIP Conference Proceedings, V

Other

Particle Acceleration, Magnetosphere Interactions, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays

Scientific paper

We discuss in detail the observation of energetic ions (30 keV-2 MeV) measured by the WIND-3D Plasma and Energetic Particle experiment at the Earth's bow shock. The events are observed near the perpendicular shock, and it seems that their occurrence requires the presence of a relatively high ion flux of ambient energetic ions as in Corotating Interaction Region or Solar Energetic Particle events. Upstream, the ion energy spectrum is usually peaked at a few hundred keV. The ions propagate upstream with an angular distribution peaked at 150° pitch-angle. However, the angular distribution is non-gyrotropic with a range of gyrophase <=180°. In the downstream side of the shock, the angular distribution of energetic particles is peaked at ~90° and is also non-gyrotropic. We show that the energy-spectrum is consistent with an adiabatic-like reflection at the shock of the incoming Corotating Interaction Region ions. However, the pitch angle distribution is satisfied only within a certain range of gyrophase angle. A similar comparison is made for energetic ions observed downstream. .

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