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Statistics of Counter-streaming Solar Wind Suprathermal Electrons at Solar Minimum: Stereo Observations : Volume 28, Issue 1 (22/01/2010)

By Lavraud, B.

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Book Id: WPLBN0003982686
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Statistics of Counter-streaming Solar Wind Suprathermal Electrons at Solar Minimum: Stereo Observations : Volume 28, Issue 1 (22/01/2010)  
Author: Lavraud, B.
Volume: Vol. 28, Issue 1
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Rouillard, A. P., Foullon, C., Skoug, R. M., Gosling, J. T., Luhmann, J. G., Larson, D. E.,...Galvin, A. B. (2010). Statistics of Counter-streaming Solar Wind Suprathermal Electrons at Solar Minimum: Stereo Observations : Volume 28, Issue 1 (22/01/2010). Retrieved from

Description: Centre d'Etude Spatiale des Rayonnements, Université de Toulouse (UPS), 9 Avenue du Colonel Roche, 31028 Toulouse Cedex 4, France. Previous work has shown that solar wind suprathermal electrons can display a number of features in terms of their anisotropy. Of importance is the occurrence of counter-streaming electron patterns, i.e., with beams both parallel and anti-parallel to the local magnetic field, which is believed to shed light on the heliospheric magnetic field topology. In the present study, we use STEREO data to obtain the statistical properties of counter-streaming suprathermal electrons (CSEs) in the vicinity of corotating interaction regions (CIRs) during the period March–December 2007. Because this period corresponds to a minimum of solar activity, the results are unrelated to the sampling of large-scale coronal mass ejections, which can lead to CSE owing to their closed magnetic field topology. The present study statistically confirms that CSEs are primarily the result of suprathermal electron leakage from the compressed CIR into the upstream regions with the combined occurrence of halo depletion at 90° pitch angle. The occurrence rate of CSE is found to be about 15–20% on average during the period analyzed (depending on the criteria used), but superposed epoch analysis demonstrates that CSEs are preferentially observed both before and after the passage of the stream interface (with peak occurrence rate >35% in the trailing high speed stream), as well as both inside and outside CIRs. The results quantitatively show that CSEs are common in the solar wind during solar minimum, but yet they suggest that such distributions would be much more common if pitch angle scattering were absent. We further argue that (1) the formation of shocks contributes to the occurrence of enhanced counter-streaming sunward-directed fluxes, but does not appear to be a necessary condition, and (2) that the presence of small-scale transients with closed-field topologies likely also contributes to the occurrence of counter-streaming patterns, but only in the slow solar wind prior to CIRs.

Statistics of counter-streaming solar wind suprathermal electrons at solar minimum: STEREO observations

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