The Excitation of Second Harmonic Poloidal ULF Waves Through Drift-Bounce Resonance With Protons in the Magnetic Dip

IF 2.6 2区地球科学 Q2 ASTRONOMY & ASTROPHYSICS Journal of Geophysical Research: Space Physics Pub Date : 2024-11-21 DOI:10.1029/2024JA032804

Yan Zhuang, Chao Yue, Li Li, Xu-Zhi Zhou, Qiu-Gang Zong, Shan Wang, Ying Liu, Xing-Yu Li, Ze-Fan Yin, Yong-Fu Wang, Zhi-Yang Liu, Haobo Fu

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Abstract

The drift-bounce resonance between ultralow-frequency (ULF) waves and charged particles is an efficient way to transfer energy. In this study, we report the excitation of ULF waves through drift-bounce resonance with protons in the magnetic dip for the first time. On 4 September 2015, Van Allen probe B observed ULF signals with a frequency of ∼10 mHz inside the magnetic dip during substorms at the dusk side. The ULF waves are further diagnosed as second harmonic poloidal waves. The 54–67 keV protons in the magnetic dip exhibit oscillations with the same period as ULF waves, providing evidence for drift-bounce resonance. Through finite Larmor radius effects, we determined that the ULF waves propagate eastward with an azimuthal wave number in the range of 237–277. The ULF waves are excited with free energy related to the enhanced proton phase space density in the magnetic dip.

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通过磁偶中质子的漂移-反弹共振激发二次谐波极坐标超低频波

超低频（ULF）波与带电粒子之间的漂移-反弹共振是一种有效的能量传递方式。在这项研究中，我们首次报告了超低频波通过与磁偶中的质子发生漂跳共振而被激发的情况。2015年9月4日，范艾伦探测器B在黄昏侧的亚暴期间，在磁偶内部观测到频率为10 mHz的超低频信号。超低频波被进一步诊断为二次谐波极性波。磁偶中 54-67 千伏的质子表现出与超低频波相同周期的振荡，为漂移-反弹共振提供了证据。通过有限拉莫尔半径效应，我们确定超低频波以方位角波数 237-277 的范围向东传播。超低频波被激发的自由能与磁倾角中增强的质子相空间密度有关。

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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