Sideband Instabilities of a Large-Amplitude Whistler Wave Due to Phase-Bunching of Resonant Particles with Small Perpendicular Velocities
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- Okamoto Katsuro
- Department of Physics, Faculty of Science, Kyoto University
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- Mima Kunioki
- Faculty of Science, Hiroshima University
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- Nishikawa Kyoji
- Faculty of Science, Hiroshima University
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- Katayama Yoshishige
- Faculty of Engineering, Nihon University
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Abstract
New types of sideband instabilities associated with a large-amplitude whistler wave propagating parallel to an external magnetic field B0 are proposed and investigated. The instabilities are due to a spiral beam consisting of resonant particles of small velocities, v⊥, perpendicular to B0. It is shown analytically that in collisionless plasmas the angles ζ between the wave magnetic field and v⊥ of these particles, when started from a random distribution, bunch quickly to π/2. A spiral beam is formed when there exist collisions which are insufficient to destroy this phase bunching, but are sufficient to prevent any other systematic variation of ζ. Under these conditions, three different whistler modes are found unstable in the immediate vicinity of the carrier wave frequency. Their growth rates can become greater than those of previously investigated sideband instabilities if the resonance velocity substantially exceeds the thermal velocity.
Journal
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 37 (6), 1658-1667, 1974
THE PHYSICAL SOCIETY OF JAPAN
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Details 詳細情報について
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- CRID
- 1390001204195510144
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- NII Article ID
- 110001959441
- 210000084690
- 130003736376
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- NII Book ID
- AA00704814
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- BIBCODE
- 1974JPSJ...37.1658O
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- ISSN
- 13474073
- 00319015
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- NDL BIB ID
- 7669798
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed