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Kinetic Structure and Wave Properties Associated with Sharp Dipolarization Front Observed by Cluster : Volume 30, Issue 1 (09/01/2012)

By Huang, S. Y.

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Book Id: WPLBN0004002183
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Kinetic Structure and Wave Properties Associated with Sharp Dipolarization Front Observed by Cluster : Volume 30, Issue 1 (09/01/2012)  
Author: Huang, S. Y.
Volume: Vol. 30, Issue 1
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

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Deng, X. H., Yuan, Z. G., Zhou, M., Wang, Q. Q., Huang, S. Y., Su, W.,...Wei, Q. (2012). Kinetic Structure and Wave Properties Associated with Sharp Dipolarization Front Observed by Cluster : Volume 30, Issue 1 (09/01/2012). Retrieved from http://kindle.worldlibrary.net/


Description
Description: School of Electronic Information, Wuhan University, Wuhan 430072, China. Multiple dipolarization fronts (DFs) were observed by Cluster spacecraft in the magnetotail during a substorm. These DFs were kinetic structures, embedded in the bursty plasma flow, and moved earthward (mainly) and dawnward. Intense electric field, parallel and perpendicular currents were detected in the DF layer. These front layers were energy dissipation region (load region) where the energy of electromagnetic fields were transferred to the plasma thermal and kinetic energy. This dissipation was dominated by electrons. There were enhancements of plasma waves around the DF region: wavelet results show that wave activities around the ion cyclotron frequency in the front layer were generated by Alfvén ion cyclotron instability; whistler waves were also detected before, during and after the DFs, which are triggered by electron temperature anisotropy and coincident with enhancement of energetic electron fluxes. The observation of these waves could be important for the understanding of evolution of DF and electron energization during the substorm. We discuss the generation mechanism of the DFs and suggest that these DFs were generated in the process of transient reconnection, and then traveled toward the Earth.

Summary
Kinetic structure and wave properties associated with sharp dipolarization front observed by Cluster

Excerpt
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