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Physics of Plasmas : Lower-hybrid drift and Buneman instabilities in current sheets with guide field

By P. H. Yoon and A. T. Lui

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Book Id: WPLBN0002169629
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 24 November 2008

Title: Physics of Plasmas : Lower-hybrid drift and Buneman instabilities in current sheets with guide field  
Author: P. H. Yoon and A. T. Lui
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Physics of Plasmas Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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Yoon And A. T. Lu, P. H. (n.d.). Physics of Plasmas : Lower-hybrid drift and Buneman instabilities in current sheets with guide field. Retrieved from http://community.worldlibrary.net/


Description
Description: Lower-hybrid drift and Buneman instabilities operate in current sheets with or without the guide field. The lower-hybrid drift instability is a universal instability in that it operates for all parameters. In contrast, the excitation of Buneman instability requires sufficiently thin current sheet. That is, the relative electron-ion drift speed must exceed the threshold in order for Buneman instability to operate. Traditionally, the two instabilities were treated separately with different mathematical formalisms. In a recent paper, an improved electrostatic dispersion relation was derived that is valid for both unstable modes [ P. H. Yoon and A. T. Y. Lui, Phys. Plasmas 15, 072101 (2008) ]. However, the actual numerical analysis was restricted to a one-dimensional situation. The present paper generalizes the previous analysis and investigates the two-dimensional nature of both instabilities. It is found that the lower-hybrid drift instability is a flute mode satisfying k⋅B = 0 and k⋅∇n = 0, where k represents the wave number for the most unstable mode, B stands for the total local magnetic field, and ∇n is the density gradient. This finding is not totally unexpected. However, a somewhat surprising finding is that the Buneman instability is a field-aligned mode characterized by k×B = 0 and k⋅∇n = 0, rather than being a beam-aligned instability.

 

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