Nonlinear bounce resonances between magnetosonic waves and equatorially mirroring electrons
文献类型：期刊论文
| 作者 | Lunjin Chen; Armando Maldonado; Jacob Bortnik; Richard M. Thorne; Jinxing Li; Lei Dai; Xiaoya Zhan |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2015 |
| 英文摘要 | Equatorially mirroring energetic electrons pose an interesting scientific problem, since they generally cannot resonate with any known plasma waves and hence cannot be scattered down to lower pitch angles. Observationally it is well known that the flux of these equatorial particles does not simply continue to build up indefinitely, and so a mechanism must necessarily exist that transports these particles from an equatorial pitch angle of 90 degrees down to lower values. However, this mechanism has not been uniquely identified yet. Here we investigate the mechanism of bounce resonance with equatorial noise (or fast magnetosonic waves). A test particle simulation is used to examine the effects of monochromatic magnetosonic waves on theequatorially mirroring energetic electrons, with a special interest in characterizing the effectiveness of bounce resonances. Our analysis shows thatbounce resonances can occur at the first three harmonics of the bounce frequency (n omega(b), n = 1, 2, and 3) and can effectively reduce the equatorial pitch angle to values where resonant scattering by whistler mode waves becomes possible. We demonstrate that the nature of bounceresonance is nonlinear, and we propose a nonlinear oscillation model for characterizing bounce resonances using two key parameters, effective wave amplitude (A) over tilde and normalized wave number (k) over tilde (z). The threshold for higher harmonic resonance is more strict, favoring higher (A) over tilde and (k) over tilde (z), and the change in equatorial pitch angle is strongly controlled by (k) over tilde (z). We also investigate the dependence ofbounce resonance effects on various physical parameters, including wave amplitude, frequency, wave normal angle and initial phase, plasma density, and electron energy. It is found that the effect of bounce resonance is sensitive to the wave normal angle. We suggest that the bounce resonant interaction might lead to an observed pitch angle distribution with a minimum at 90 degrees. |
| 收录类别 | SCI |
| 原文出处 | http://onlinelibrary.wiley.com/wol1/doi/10.1002/2015JA021174/full |
| 语种 | 英语 |
| 源URL | [http://ir.siat.ac.cn:8080/handle/172644/6914]  |
| 专题 | 深圳先进技术研究院_数字所 |
| 作者单位 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS |
| 推荐引用方式 GB/T 7714 | Lunjin Chen,Armando Maldonado,Jacob Bortnik,et al. Nonlinear bounce resonances between magnetosonic waves and equatorially mirroring electrons[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2015. |
| APA | Lunjin Chen.,Armando Maldonado.,Jacob Bortnik.,Richard M. Thorne.,Jinxing Li.,...&Xiaoya Zhan.(2015).Nonlinear bounce resonances between magnetosonic waves and equatorially mirroring electrons.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS. |
| MLA | Lunjin Chen,et al."Nonlinear bounce resonances between magnetosonic waves and equatorially mirroring electrons".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS (2015). |
入库方式： OAI收割
来源：深圳先进技术研究院
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