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| Titel |
The Earth's magnetopause as a source and sink for equatorial nightside energetic charged particles |
| VerfasserIn |
M. M. Klida, T. A. Fritz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 11 ; Nr. 27, no. 11 (2009-11-26), S.4305-4316 |
| Datensatznummer |
250016712
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4305-2009.pdf |
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| Zusammenfassung |
| The Imaging Proton Spectrometer (IPS) and the Imaging Electron Spectrometer
(IES) on the Polar satellite have measured temporary deviations in the
isotropy of the pitch angle distributions (PADs) of charged particles in the
inner magnetosphere. As Polar passes through the nightside equatorial region,
the IPS and IES observe dropouts of charged particles with pitch angles near
90°, known as butterfly distributions caused by the shadowing of the
magnetopause. Additionally, Polar observes a lower energy (<60 keV) intensification of locally mirroring ions while simultaneously
detecting butterfly PADs in both higher energy ions and electrons. While it
is accepted that charged particles can be lost to the magnetopause due to
shadowing effects, the modeling here can suggest that the magnetopause can
also be a direct source for particles observed in magnetosphere, with a
strong dependence upon both pitch angle and particle energy. |
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