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Nonlinear Electron Acoustic Structures Generated on the High-potential Side of a Double Layer : Volume 16, Issue 2 (30/04/2009)

By Pottelette, R.

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Book Id: WPLBN0003980785
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Nonlinear Electron Acoustic Structures Generated on the High-potential Side of a Double Layer : Volume 16, Issue 2 (30/04/2009)  
Author: Pottelette, R.
Volume: Vol. 16, Issue 2
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Berthomier, M., & Pottelette, R. (2009). Nonlinear Electron Acoustic Structures Generated on the High-potential Side of a Double Layer : Volume 16, Issue 2 (30/04/2009). Retrieved from http://hawaiilibrary.net/


Description
Description: LPP-CNRS/INSU, 4 avenue de Neptune, 94107 Saint-Maur des Fossés, France. High-time resolution measurements of the electron distribution function performed in the auroral upward current region reveals a large asymmetry between the low- and high-potential sides of a double-layer. The latter side is characterized by a large enhancement of a locally trapped electron population which corresponds to a significant part (~up to 30%) of the total electron density. As compared to the background hot electron population, this trapped component has a very cold temperature in the direction parallel to the static magnetic field. Accordingly, the differential drift between the trapped and background hot electron populations generates high frequency electron acoustic waves in a direction quasi-parallel to the magnetic field. The density of the trapped electron population can be deduced from the frequency where the electron acoustic spectrum maximizes. In the auroral midcavity region, the electron acoustic waves may be modulated by an additional turbulence generated in the ion acoustic range thanks to the presence of a pre-accelerated ion beam located on the high-potential side of the double layer. Electron holes characterized by bipolar pulses in the electric field are sometimes detected in correlation with these electron acoustic wave packets.

Summary
Nonlinear electron acoustic structures generated on the high-potential side of a double layer

Excerpt
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