Other
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..528..286f&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
The 3D Plasma and Energetic Particle instrument on the Wind spacecraft has recorded more than 100 upstream ion events which contain heavy ions of ~2 MeV. The detailed in situ observations made by Wind can shed light on a process that not only produces high energy ions upstream of the Earth's bow shock, but which scales geometrically to larger astrophysical systems, and can therefore provide insight into the production of cosmic rays. Three-dimensional distribution functions of these bursts show these events to be highly nongyrotropic, from ~100 keV to ~2 MeV. In a typical event, nearly all of the flux is gyrophase-bunched, with an angular width of ~60 degrees. These nongyrotropic bursts are explained by a model of Fermi acceleration in which suprathermal heavy ions of solar wind origin, such as O6+, are energized through repeated reflections between large-scale magnetic field rotations in the upstream region and the bow shock. .
Freeman Theodore J.
Larson Davin E.
Lin Robert P.
Meziane Karim
Parks George K.
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