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Resonant Weibel instability in counterstreaming plasmas with temperature anisotropies

Published online by Cambridge University Press:  19 May 2009

M. LAZAR ,
M. E. DIECKMANN  and
S. POEDTS
M. LAZAR
Affiliation:
Center for Plasma Astrophysics, Celestijnenlaan 200B, 3001 Leuven, Belgium (mlazar@tp4.rub.de) Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany
M. E. DIECKMANN
Affiliation:
Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany Department of Science and Technology (ITN), Linköping University, 60174 Norrköping, Sweden
S. POEDTS
Affiliation:
Center for Plasma Astrophysics, Celestijnenlaan 200B, 3001 Leuven, Belgium (mlazar@tp4.rub.de)
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Abstract

The Weibel instability, driven by a plasma temperature anisotropy, is non-resonant with plasma particles: it is purely growing in time, and does not oscillate. The effect of a counterstreaming plasma is examined. In a counterstreaming plasma with an excess of transverse temperature, the Weibel instability arises along the streaming direction. Here it is proved that for large wave-numbers the instability becomes resonant with a finite real (oscillation) frequency, ωr ≠ 0. When the plasma flows faster, with a bulk velocity larger than the parallel thermal velocity, the instability becomes dominantly resonant. This new feature of the Weibel instability can be relevant for astrophysical sources of non-thermal emissions and the stability of counterflowing plasma experiments.

Type
Papers
Information
Journal of Plasma Physics , Volume 76 , Issue 1 , February 2010 , pp. 49 - 56
Copyright
Copyright © Cambridge University Press 2009

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