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- Title
Magnetosonic Waves Observed by the Van Allen Probe‐A Satellite: The Chirikov Resonance Overlap Criterion.
- Authors
Wang, Yangyang; Ouyang, Zhihai; Tang, Rongxin; Li, Haimeng; Yu, Xiongdong; Yuan, Zhigang; Deng, Xiaohua
- Abstract
Magnetosonic waves (MSWs) can be discrete or continuous in a time‐frequency spectrogram. For discrete MSWs that satisfy the Chirikov resonance overlap criterion (CROC), the spectrum can be regarded as continuous and hence the quasi‐linear theory can be employed to calculate the corresponding electron diffusion coefficient; otherwise, the contribution of each harmonic emission to the diffusion coefficient should be calculated separately. From the Van Allen Probe‐A (RBSP‐A) burst mode observations taken between January 2014 to December 2017, a total of 21,766 discrete MSW events were selected for statistical analysis, among which 314 events (1.44%) are found to not satisfy the CROC. The MSW events not satisfying the CROC are mainly distributed in the range between L ∼ 4 and 6 outside the plasmapause, they all have a frequency gap (e.g., a frequency difference ≥2 fcH between two discrete bands). Plain Language Summary: Radiation belt electrons resonate with magnetosonic waves (MSWs) through Landau and bounce resonances. Quasi‐linear diffusion theory is widely used in describing the interactions between charged particles and small amplitude, sufficiently broadband waves. However, the diffusion coefficients incorporated into numerical codes aiming to describe the inner magnetosphere dynamics are typically computed under the assumption that the MSW spectrum is continuous in frequency space. In this letter, based on high‐resolution Van Allen Probe‐A (RBSP‐A) burst mode data, two typical events in which discrete spectrum MSWs do not satisfy the Chirikov resonance overlap criterion (CROC) are reported. To analyze the global distribution and harmonic characteristics of MSWs that do not satisfy the CROC, 314 MSW events that do not satisfy the CROC are screened for statistical study. Key Points: Among 21,766 discrete magnetosonic waves (MSW) events, 314 events (1.44%) do not satisfy the Chirikov resonance overlap criterion (CROC) while 21,452 events (98.56%) satisfy the CROCOf 1,057 discrete MSW events with a frequency gap greater than 7 fcH, 281 events (26.58%) do not satisfy the CROCQuasi‐linear diffusion theory can be applied to all discrete spectrum MSWs with continuous harmonics
- Subjects
RESONANCE; ELECTRON diffusion; DIFFUSION coefficients; RADIATION belts; MAGNETOSPHERE
- Publication
Geophysical Research Letters, 2023, Vol 50, Issue 3, p1
- ISSN
0094-8276
- Publication type
Article
- DOI
10.1029/2022GL102368