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On Acceleration of <1 Mev/N He Ions in the Corotating Compression Regions Near 1 Au: Stereo Observations : Volume 27, Issue 9 (30/09/2009)

By Bučík, R.

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Book Id: WPLBN0003981800
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File Size: Pages 14
Reproduction Date: 2015

Title: On Acceleration of <1 Mev/N He Ions in the Corotating Compression Regions Near 1 Au: Stereo Observations : Volume 27, Issue 9 (30/09/2009)  
Author: Bučík, R.
Volume: Vol. 27, Issue 9
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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Mall, U., Mason, G. M., Korth, A., & Bučík, R. (2009). On Acceleration of <1 Mev/N He Ions in the Corotating Compression Regions Near 1 Au: Stereo Observations : Volume 27, Issue 9 (30/09/2009). Retrieved from

Description: Max-Planck-Institut für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany. Observations of multi-MeV corotating interaction region (CIR) ions are in general consistent with models of CIR shock acceleration and transport. The presence of suprathermal particles near 1 AU in unshocked compression regions is not adequately explained. Nonetheless, more recent works demonstrate that unshocked compression regions associated with CIRs near 1 AU could energize particles. In the energy range from ~0.1 to ~1 MeV/n we investigate CIR events observed in 2007–2008 by the STEREO A and B spacecraft. We treat the predictions of compression acceleration by comparing the observed ion intensities with the model parameters. These observations show that the ion intensity in CIR events with in-situ reverse shock is well organized by the parameters which characterize the compression region itself, like compression width, solar wind speed gradients and the total pressure. In turn, for CIR events with the absence of the shocks the model predictions are not fulfilled.

On acceleration of <1 MeV/n He ions in the corotating compression regions near 1 AU: STEREO observations

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