Identification of Coupled Landau and Anomalous Resonances in Space Plasmas
Jing‐Huan Li, Xu‐Zhi Zhou, Zhi‐Yang Liu, Shan Wang, Anton Artemyev, Yoshiharu Omura, Xiao‐Jia Zhang, Li Li, Chao Yue, Qiugang Zong, C. J. Pollock, G. Le, J. L. Burch
Abstract
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.
Topics & Concepts
PhysicsResonance (particle physics)Landau dampingSpectral linePlasmaWhistlerCoupling (piping)Phase (matter)Phase spacePhase velocityAtomic physicsSpace (punctuation)Quantum mechanicsMaterials scienceLinguisticsPhilosophyMetallurgyIonosphere and magnetosphere dynamicsSolar and Space Plasma DynamicsAstro and Planetary Science