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Cluster and Tc-1 Observation of Magnetic Holes in the Plasma Sheet : Volume 30, Issue 3 (26/03/2012)

By Sun, W. J.

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Book Id: WPLBN0004002147
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: Cluster and Tc-1 Observation of Magnetic Holes in the Plasma Sheet : Volume 30, Issue 3 (26/03/2012)  
Author: Sun, W. J.
Volume: Vol. 30, Issue 3
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Reme, H., Zong, Q. G., Tang, C. L., Fazakerley, A., Shi, Q. Q., Xiao, T.,...Lucek, E. (2012). Cluster and Tc-1 Observation of Magnetic Holes in the Plasma Sheet : Volume 30, Issue 3 (26/03/2012). Retrieved from http://community.worldlibrary.net/


Description
Description: Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, School of Space Science and Physics, Shandong University at Weihai, Weihai, China. Magnetic holes with relatively small scale sizes, detected by Cluster and TC-1 in the magnetotail plasma sheet, are studied in this paper. It is found that these magnetic holes are spatial structures and they are not magnetic depressions generated by the flapping movement of the magnetotail current sheet. Most of the magnetic holes (93%) were observed during intervals with Bz larger than Bx, i.e. they are more likely to occur in a dipolarized magnetic field topology. Our results also suggest that the occurrence of these magnetic holes might have a close relationship with the dipolarization process. The magnetic holes typically have a scale size comparable to the local proton Larmor radius and are accompanied by an electron energy flux enhancement at a 90° pitch angle, which is quite different from the previously observed isotropic electron distributions inside magnetic holes in the plasma sheet. It is also shown that most of the magnetic holes occur in marginally mirror-stable environments. Whether the plasma sheet magnetic holes are generated by the mirror instability related to ions or not, however, is unknown. Comparison of ratios, scale sizes and propagation direction of magnetic holes detected by Cluster and TC-1, suggests that magnetic holes observed in the vicinity of the TC-1 orbit (~7–12 RE) are likely to be further developed than those observed by Cluster (~7–18 RE).

Summary
Cluster and TC-1 observation of magnetic holes in the plasma sheet

Excerpt
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