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| Titel |
STEREO/SEPT observations of upstream particle events: almost monoenergetic ion beams |
| VerfasserIn |
A. Klassen, R. Gómez-Herrero, R. Müller-Mellin, S. Böttcher, B. Heber, R. Wimmer-Schweingruber, G. M. Mason |
| 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. 5 ; Nr. 27, no. 5 (2009-05-06), S.2077-2085 |
| Datensatznummer |
250016526
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| Publikation (Nr.) |
 copernicus.org/angeo-27-2077-2009.pdf |
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| Zusammenfassung |
| We present observations of Almost Monoenergetic Ion (AMI) events in the energy range
of 100–1200 keV detected with
the Solar Electron and Proton Telescope (SEPT) onboard both STEREO spacecraft.
The energy spectrum of AMI events contain 1, 2, or 3 narrow peaks with the relative width
at half maximum of 0.1–0.7 and their energy maxima varies for different events from 120 to 1200 keV.
These events were detected close to
the bow-shock (STEREO-A&B) and to the magnetopause at STEREO-B as well as unexpectedly far
upstream of the bow-shock and far away from
the magnetotail at distances up to 1100 RE (STEREO-B) and 1900 RE (STEREO-A).
We discuss the origin of AMI events, the connection
to the Earth's bow-shock and to the magnetosphere, and the conditions of the interplanetary medium and
magnetosphere under which these AMI bursts occur. Evidence that the detected spectral peaks
were caused by quasi-monoenergetic beams of protons, helium, and heavier ions are given. Furthermore,
we present the spatial distribution of all AMI events from December 2006 until August 2007. |
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