Relativistic study of electromagnetic electron cyclotron instability based on trapped electrons in kappa-Maxwellian auroral plasmas,Contributions to Plasma Physics

当前位置： X-MOL 学术 › Contrib. Plasm. Phys. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Relativistic study of electromagnetic electron cyclotron instability based on trapped electrons in kappa-Maxwellian auroral plasmas
Contributions to Plasma Physics ( IF 1.3 ) Pub Date : 2021-03-19 , DOI: 10.1002/ctpp.202100012
M. Nazeer ₁ , M.N.S. Qureshi ₁ , C. Shen ₂

Affiliation

The presence of relativistic electrons in the Earth's magnetosphere may excite EMEC waves via resonant interaction. The understanding of EMEC waves induced by such electrons requires relativistic treatment. Therefore, we present here the investigation of EMEC waves based on relativistic trapped electrons represented by kappa-Maxwellian distribution in auroral plasmas. The analytical expressions of real frequency and relativistic growth rate are derived. Our numerical outcomes report that relativistic approximation increases the wave growth and causes reduction in the threshold value of drift velocity of trapped electrons for instability. The wave frequency that corresponds to the maximum growth decreases as we go from nonrelativistic limit to relativistic. The maximum growth increases with the increment in plasma frequency, perpendicular thermal velocity, drift velocity of trapped electrons, and Lorentz factor γ. Moreover, the relativistic effects on maximum growth are more pronounced for smaller values of drift velocity and perpendicular thermal velocity.

中文翻译：

基于κ-麦克斯韦极光等离子体中俘获电子的电磁电子回旋不稳定性的相对论研究

地球磁层中相对论电子的存在可能会通过共振相互作用激发 EMEC 波。理解由这种电子引起的 EMEC 波需要相对论处理。因此，我们在此介绍了基于以极光等离子体中 kappa-Maxwellian 分布为代表的相对论俘获电子的 EMEC 波研究。推导出实频率和相对论增长率的解析表达式。我们的数值结果报告说，相对论近似增加了波的增长，并导致不稳定的俘获电子漂移速度的阈值降低。当我们从非相对论限制到相对论时，对应于最大增长的波频率会降低。最大增长随着等离子体频率的增加而增加，γ。此外，对于较小的漂移速度和垂直热速度值，相对论对最大增长的影响更为明显。

更新日期：2021-03-19

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11