一維與二維電漿全粒子電磁模式之發展與應用;Development of one- and two-dimensional electromagnetic particle codes

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题名:	一維與二維電漿全粒子電磁模式之發展與應用;Development of one- and two-dimensional electromagnetic particle codes
作者:	陳尚甫;Chen,Shang-Fu
贡献者:	太空科學研究所
关键词:	電子孤立波;電漿全粒子電磁模式;electron solitary waves;one- and two-dimensional electromagnetic particl
日期:	2012-08-21
上传时间:	2012-09-11 18:25:56 (UTC+8)
出版者:	國立中央大學
摘要:	人造衛星在地球磁尾電漿片邊界層和高緯度極光區觀測到許多一維與二維的Electrostatic Solitary Wave(ESW) 結構，近年來，在地球磁尾電漿片邊界層更發現相關的磁場擾動現象。本論文將著重於電子尺度的電場脈衝結構，發展一維與二維電漿全粒子電磁模式之數值模擬碼，用來研究因電子束不穩定而產生的電場脈衝之結構。模擬中考慮的自由參數包括：電子束間的相對流速、電子束的熱速度、與電子束的粒子數量比。本論文以多流體線性理論做分析，並討論上述各種模擬參數對電場脈衝結構的影響，以及比較一維與二維系統在非線性發展過程中電場脈衝結構的差異性。1D and 2D electrostatic solitary waves (ESW) were observed by spacecraft in Earth’s plasma sheet boundary layer and auroral zone. Recently, the observation of magnetic perturbations caused by ESW has been found in Earth’s plasma sheet. Because the time scales of ESW waveforms are related to the dynamics of electrons, we study the nonlinear evolution of electron two-stream instability in one- and two-dimensional systems. We develop one- and two-dimensional electromagnetic particle-in-cell codes and perform simulations for various sets of electron beam drift velocity, initial electron thermal velocity and number of beam electrons. We discuss the effects of different parameters on the evolution of electron solitary waves, and analyze the results of simulation by linear theory. We also compare with the differences between one- and two-dimensional simulation results.
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