2023/03/14 by Zeyu An, An, Zeyu, Xin Tao +5
Physics and Astronomy · Earth and Planetary Sciences · #Ionosphere and magnetosphere dynamics #Earthquake Detection and Analysis #Magnetic confinement fusion research
paper · pdf · doi:10.48550/arxiv.2303.07799
Electromagnetic ion cyclotron waves are known to exhibit frequency chirping, contributing to the rapid scattering and acceleration of energetic particles. However, the physical mechanism of chirping remains elusive. Here, we propose a new model to explain the chirping and provide direct observational evidence for validation. Our results relate the frequency chirping of the wave to both the wave amplitude and magnetic field inhomogeneity for the first time. The general applicability of the model's underlying principle opens a new path toward understanding the frequency chirping of other waves.