Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm13b1817o&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM13B-1817
Physics
Plasma Physics
[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [7859] Space Plasma Physics / Transport Processes
Scientific paper
Energetic ions extending up to ~1 MeV in energy originating from the vicinity of the Earth are observed in the upstream interplanetary space and are known as upstream ion events. Although these upstream ions are often accompanied by energetic electrons with energies between ~30-300 keV, it is presently unclear whether the presence of energetic electrons represents a special class of upstream events or whether the presence indicates a magnetospheric origin and rules out Fermi acceleration at the bow shock. This is partly because the properties of upstream ion events with and without electron association have not yet been well investigated. In this paper, we present preliminary results from a systematic survey of upstream events observed from 2007 to 2010 by the Wind spacecraft. Specifically, we compare and contrast various ion properties (e.g., duration times, intensities, energy spectra, composition, and location) for events accompanied by energetic electrons with those that are not. In addition, we compare the occurrence of upstream events with the state of the magnetosphere in order to identify what aspects of geomagnetic activity, if any, are associated with the production of upstream events, and which indicators best characterize them. Finally, we discuss our new observations in terms of the two main models i.e., magnetospheric leakage and bow shock acceleration, to shed light on the origin of these events.
Desai Mihir I.
Mason Glenn M.
Ogasawara K.
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