| GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS |
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Ion Velocity Distributions in a Non-Stationary Perpendicular Shock |
| YANG Zhong-Wei1,2, LU Quan-Ming1,2, WANG Shui1 |
| 1CAS Key Laboratory of Basic Plasma Physics, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 2300262State Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190 |
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| Cite this article: |
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YANG Zhong-Wei, LU Quan-Ming, WANG Shui 2010 Chin. Phys. Lett. 27 019601 |
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Abstract Previous particle-in-cell simulations have evidenced that supercritical, quasi-perpendicular shocks are non-stationary. By separating the incident ions into reflected (R) and directly transmitted (DT) parts, we investigate the ion distributions in a non-stationary perpendicular shock. The upstream ion distributions have two parts corresponding to the R and incident ions respectively, while the R ions have higher energy. The downstream ions have a core-ring distribution. The core and ring parts correspond to the DT and R ions, respectively. The ion distributions depend largely on the non-stationary shock structure. The percentage of the reflected ions cyclically varies in time with a period equal to the shock self-reformation cycle, and the number of the R ions increases with the steepness of the shock ramp.
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| Keywords:
96.50.Fm
94.05.Pt
96.50.Ry
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Received: 24 August 2009
Published: 30 December 2009
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| PACS: |
96.50.Fm
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(Planetary bow shocks; interplanetary shocks)
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94.05.Pt
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(Wave/wave, wave/particle interactions)
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96.50.Ry
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(Discontinuities)
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