| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Whistler-Mode Waves Growth by a Generalized Relativistic Kappa-Type Distribution |
| ZHOU Qing-Hua1,2, JIANG Bin1, SHI Xiang-Hua1, LI Jun-Qiu1 |
| 1School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 4100762State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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ZHOU Qing-Hua, JIANG Bin, SHI Xiang-Hua et al 2009 Chin. Phys. Lett. 26 025201 |
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Abstract The instability of field-aligned Whistler-mode waves in space plasmas is studied by using a recently developed generalized relativistic kappa-type (KT) distribution. Numerical calculations are performed for a direct comparison between the new KT distribution and the current kappa distribution. We show that the wave growth for the KT distribution tends to occur in the lower wave frequency (e.g., ω≤0.1 Ωe) due to a larger fractional number of the resonant electrons ηrel (which controls the wave growth), while primarily locating in the higher wave frequency for the kappa distribution. Moreover, the relativistic anisotropy Arel by the KT distribution is found to be smaller than that by the kappa distribution, leading to a smaller peak of wave growth. The results present a further understanding of plasma wave instability particularly in those plasmas where relativistic electrons are present.
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| Keywords:
52.27.Ny
94.20.Wf
94.20.Wj
52.35.Hr
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Received: 05 August 2008
Published: 20 January 2009
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| PACS: |
52.27.Ny
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(Relativistic plasmas)
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94.20.wf
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(Plasma waves and instabilities)
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94.20.wj
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(Wave/particle interactions)
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52.35.Hr
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(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
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