Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 127, Issue 5, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022JA030428
Keywords
wave particle interaction; whistler-mode wave; hiss; plasmasphere; magnetosphere; particle simulation
Categories
Funding
- JSPS KAKENHI [JP17H06140]
Ask authors/readers for more resources
The study investigates the nonlinear wave growth process of plasmaspheric hiss in the equatorial plasmasphere through electromagnetic particle simulations in a uniform magnetic environment. The analysis of wavenumber-time evolution reveals the coherence and nonlinear growth of wave packets within a specific range of the inhomogeneity factor S.
We conduct electromagnetic particle simulations in a uniform magnetic environment to verify the nonlinear wave growth process of plasmaspheric hiss in the equatorial plasmasphere. The satisfaction of the separability criterion for coexisting multiple frequency waves in the initial stage of wavenumber-time evolution declares that wave packets are coherent and capable of growing nonlinearly. Spatial and temporal evolutions of two typical modes located in wavenumber-time evolution demonstrate the consistency among wave growths, frequency variations, and inhomogeneity factor S in coherent wave packets, showing that rising and falling tones occur at negative and positive S values, respectively, and an obvious wave growth happens in a reasonable range of S satisfying the second-order resonance condition. Wave packets extracted from wave fields in space and time by a frequency band-pass filter confirm a good agreement between the nonlinear theory and simulation results. The nonlinear growth rates of the extracted wave packets possess similar magnitudes to the growth rates of wave packets in the simulation, and they are much greater than the theoretical linear growth rate, indicating that the nonlinear process is essential in the generation of plasmaspheric hiss.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available