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Stereo/Sept Observations of Upstream Particle Events: Almost Monoenergetic Ion Beams : Volume 27, Issue 5 (06/05/2009)

By Klassen, A.

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Book Id: WPLBN0003975832
Format Type: PDF Article :
File Size: Pages 9
Reproduction Date: 2015

Title: Stereo/Sept Observations of Upstream Particle Events: Almost Monoenergetic Ion Beams : Volume 27, Issue 5 (06/05/2009)  
Author: Klassen, A.
Volume: Vol. 27, Issue 5
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Müller-Mellin, R., Gómez-Herrero, R., Wimmer-Schweingruber, R., Heber, B., Mason, G. M., Böttcher, S., & Klassen, A. (2009). Stereo/Sept Observations of Upstream Particle Events: Almost Monoenergetic Ion Beams : Volume 27, Issue 5 (06/05/2009). Retrieved from

Description: Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24118 Kiel, Germany. 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.

STEREO/SEPT observations of upstream particle events: almost monoenergetic ion beams

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