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Stochastic Acceleration of Electrons by the Right-Hand Extraordinary Mode in the High Density Plasma Region |
| XIAO Fu-Liang1;ZHENG Hui-Nan2;WANG Shui2 |
| 1Department of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 410076
2School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026 |
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| Cite this article: |
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XIAO Fu-Liang, ZHENG Hui-Nan, WANG Shui 2005 Chin. Phys. Lett. 22 1552-1555 |
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Abstract The resonant acceleration of electrons by the superluminous R-X mode is evaluated in the high density plasma region of Earth, specifically around the geostationary orbit. The corresponding resonant frequency range together with the harmonic N required for producing a significant acceleration is studied in detail. It is found that the stochastic acceleration is basically controlled by the harmonic N and a dimensionless parameter α=|Ωe2|/ωpe2 (where |Ωe| and ωpe are the electron gyrofrequency and plasma frequency respectively). For α= 0.1 (around the geostationary orbit), there are not gyroresonances occurring between electrons and right-hand extraordinary-mode electromagnetic waves until higher harmonics N ≥ 4; while for α= 0.5, the gyroresonance begins at N=2. Substantial acceleration of electrons by the right-hand extraordinary mode is possible for those higher harmonic (N>1) resonances over a wide range of wave normal angles θ. This indicates that higher harmonic resonance can play an important role on the electron acceleration in the high density plasma region (α<1).
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| Keywords:
94.20.Rr
52.35.Hr
94.30.Hn
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Published: 01 June 2005
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| PACS: |
94.20.Rr
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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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94.30.Hn
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(Energetic trapped particles)
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