Two dimensional simulation of amplitude modulated electron plasma waves |
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Authors: | M Zhou XH Deng Y Pang SY Li RX Tang JF Wang ZG Yuan |
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Institution: | 1. Department of Space Physics, School of Electronic and Information, Wuhan University, 430079, PR China;2. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, 430079, PR China |
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Abstract: | Highly modulated waves near electron plasma frequency with both parallel and perpendicular polarization have been observed near diffusion region at dayside and in the tail region. In this paper, two dimensional Particle-In-Cell (PIC) simulation was performed to study the possible generation mechanism of these modulated electron plasma waves. It is shown that weak beam instability could generate the modulated Langmuir wave and the ambient magnetic field plays an important role in the formation of modulation. When the weak beam has loss cone distribution, highly modulated upper hybrid waves are generated and propagate with large angle to the ambient magnetic field. The properties of these modulated waves are discussed and compared with observations. |
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Keywords: | PIC simulation Amplitude modulated wave Langmuir wave Upper hybrid wave |
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