Generation of Perpendicular Ion Acoustic Waves in the Ramp Region of Earth's Bow Shock in the Presence of a Flat-Top Electron Velocity Distribution

IF 2.6 2区 地球科学 Q2 ASTRONOMY & ASTROPHYSICS
Manpreet Singh, Federico Fraschetti, Joe Giacalone
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引用次数: 0

Abstract

We investigate the generation and stability of ion acoustic waves (IAWs) in the ramp region of perpendicular Earth's bow shock. Using a fluid model, we derive the dispersion relation of IAWs, assuming a flat-top electron velocity distribution function typically observed at interplanetary and Earth's bow shocks, along with jumps in plasma parameters. Our findings show that these electrostatic modes are non-dispersive within the shock ramp, which is in agreement with in-situ observations from the Magnetospheric Multiscale Mission (MMS). The calculated frequencies and phase velocities align closely with MMS measurements. Furthermore, we find that the growth rate of IAWs is more strongly affected by the ion temperature jump across the shock than by the electron temperature jump. The methodology developed in this work can be extended to investigate the generation and stability of other wave modes in diverse space and astrophysical plasma environments.

平顶电子速度分布下地球弓形激波斜坡区垂直离子声波的产生
本文研究了垂直地弓形激波斜坡区离子声波的产生和稳定性。利用流体模型,我们推导了定律的色散关系,假设在行星际和地球弓形激波中观测到的平顶电子速度分布函数,以及等离子体参数的跳跃。我们的研究结果表明,这些静电模式在激波斜坡内是非色散的,这与磁层多尺度任务(MMS)的原位观测结果一致。计算的频率和相速度与MMS测量结果非常接近。此外,我们发现离子温度在激波上的跃迁比电子温度的跃迁对定律的增长率的影响更大。在这项工作中开发的方法可以扩展到研究不同空间和天体物理等离子体环境中其他波模式的产生和稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geophysical Research: Space Physics
Journal of Geophysical Research: Space Physics Earth and Planetary Sciences-Geophysics
CiteScore
5.30
自引率
35.70%
发文量
570
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