Li Jing-Huan, Zhou Xu-Zhi, Liu Zhi-Yang, Wang Shan, Artemyev Anton V, Omura Yoshiharu, Zhang Xiao-Jia, Li Li, Yue Chao, Zong Qiu-Gang, Pollock Craig, Le Guan, Burch James L
School of Earth and Space Sciences, <a href="https://ror.org/02v51f717">Peking University</a>, Beijing 100871, China.
Institut de Recherche en Astrophysique et Planétologie, CNES-CNRS, Universite Toulouse III, Paul Sabatier, Toulouse 31028, France.
Phys Rev Lett. 2024 Jul 19;133(3):035201. doi: 10.1103/PhysRevLett.133.035201.
Wave-particle resonance, a ubiquitous process in the plasma universe, occurs when resonant particles observe a constant wave phase to enable sustained energy transfer. Here, we present spacecraft observations of simultaneous Landau and anomalous resonances between oblique whistler waves and the same group of protons, which are evidenced, respectively, by phase-space rings in parallel-velocity spectra and phase-bunched distributions in gyrophase spectra. Our results indicate the coupling between Landau and anomalous resonances via the overlapping of the resonance islands.
波粒共振是等离子体宇宙中普遍存在的过程，当共振粒子观察到恒定的波相位以实现持续的能量转移时就会发生。在此，我们展示了航天器对斜向哨声波与同一组质子之间同时发生的朗道共振和反常共振的观测结果，这分别由平行速度谱中的相空间环和陀螺相位谱中的相位聚束分布所证实。我们的结果表明，通过共振岛的重叠，朗道共振和反常共振之间存在耦合。
