Cross-Scale Interactions Between ULF Waves, VLF Waves, and Electrons

IF 4.6 1区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Geophysical Research Letters Pub Date : 2025-05-22 DOI:10.1029/2025GL115095

Xing-Yu Li, Qiu-Gang Zong, Shan Wang, Xu-Zhi Zhou, Chao Yue, Li Li, Zhi-Yang Liu, Yong-Fu Wang, Ze-Fan Yin, Yi-Xin Sun, Yi-Xin Hao, Craig Pollock, Christopher T. Russell, Robert E. Ergun, Per-Arne Lindqvist

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引用次数: 0

Abstract

Wave-particle interactions are essential for energy transport in the magnetosphere. In this study, we investigated an event during which electrons interact simultaneously with waves in different scales, using data from the Magnetospheric Multiscale mission. At the macroscale ( $\sim 1 0^{5}$ km), drift resonance between ultra-low frequency (ULF) waves and 70–300 keV electrons is observed. At the microscale ( $\sim 1 0^{0} - 1 0^{1}$ km), lower-band chorus waves and electron cyclotron harmonic (ECH) waves are alternately generated, showing signatures of modulation by ULF waves. We found that compressional ULF waves affect the temperature anisotropy of 1–10 keV electrons, thereby periodically exciting chorus waves. Through linear instability analysis, we propose that ULF waves modulate ECH wave emissions by regulating the gradient of electron phase space density at the edge of the loss cone. Our results enhance the understanding of cross-scale wave-particle interactions, highlighting their importance in magnetospheric dynamics.

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超低频波、甚高频波和电子之间的跨尺度相互作用

波粒相互作用对于磁层中的能量传递是必不可少的。在这项研究中，我们利用磁层多尺度任务的数据，研究了电子与不同尺度的波同时相互作用的事件。在宏观尺度上（~ 1 0 5 ${\sim} 1{0}^{5}$ km），观察到超低频（ULF）波与70-300 keV电子之间的漂移共振。在微观尺度上（~ 1 0 0−1 0 1 ${\sim} 1{0}^{0}-1{0}^{1}$ km），低波段合唱波和电子回旋谐波（ECH）波交替产生，显示出ULF波调制的特征。我们发现纵波影响1-10 keV电子的温度各向异性，从而周期性地激发合唱波。通过线性不稳定性分析，我们提出超低频波通过调节损耗锥边缘的电子相空间密度梯度来调制电磁波发射。我们的结果增强了对跨尺度波粒相互作用的理解，突出了它们在磁层动力学中的重要性。

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来源期刊

Geophysical Research Letters 地学-地球科学综合

CiteScore

9.00

自引率

9.60%

发文量

1588

审稿时长

2.2 months

期刊介绍： Geophysical Research Letters (GRL) publishes high-impact, innovative, and timely research on major scientific advances in all the major geoscience disciplines. Papers are communications-length articles and should have broad and immediate implications in their discipline or across the geosciences. GRLmaintains the fastest turn-around of all high-impact publications in the geosciences and works closely with authors to ensure broad visibility of top papers.