Journal article
Statistics of Whistler‐Mode Waves in the Near‐Earth Plasma Sheet
Journal of geophysical research. Space physics, v 127(8), pn/a
Aug 2022
Abstract
Electromagnetic whistler‐mode waves are among the wave modes mainly responsible for energetic electron scattering and acceleration in the inner magnetosphere and near‐Earth plasma sheet. Although whistler‐driven electron precipitation significantly contributes to diffuse aurora at large L‐shells of ∼9–13, all existing empirical models of whistler‐mode waves are limited to the inner magnetosphere, at L < 9. This study aims to utilize more than 10 years of Time History of Events and Macroscale Interactions during Substorms observations to investigate main properties of whistler‐mode waves in the near‐Earth plasma sheet. We reveal relations between wave intensity Bw2 $\left({B}_{w}^{2}\right)$ and characteristics of the anisotropic electron population. We showed that in 99% of whistler wave events, the observed Bw2 ${B}_{w}^{2}$, mean wave frequency 〈f〉, and wave spectrum width Δf are consistent with expectations from the quasi‐linear theory of wave‐particle resonant interactions. Based on these statistics, we built an empirical model of Bw2 ${B}_{w}^{2}$, 〈f〉, and Δf as a function of L‐shell and MLT. This model extends existing inner magnetosphere models to a higher L‐shell range.
Key Points
We have constructed an empirical model of whistler‐mode waves in the quiet near‐Earth plasma sheet
99% of observed waves resonate with electrons in the quasi‐linear regime
Whistler wave intensity correlates with the linear growth rate of unstable electrons
Metrics
Details
- Title
- Statistics of Whistler‐Mode Waves in the Near‐Earth Plasma Sheet
- Creators
- L. Gao - Nyheim Plasma Institute Drexel University Camden NJ USAD. Vainchtein - Drexel UniversityA. V. Artemyev - Space Research InstituteX.‐J. Zhang - University of California
- Publication Details
- Journal of geophysical research. Space physics, v 127(8), pn/a
- Number of pages
- 14
- Grant note
- NASA (80NSSC19K0266; 80NSSC20K1578; 80NSSC20K0218; 80NSSC19K0844)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- C. and J. Nyheim Plasma Institute
- Web of Science ID
- WOS:000842468800001
- Scopus ID
- 2-s2.0-85136846076
- Other Identifier
- 991019168907704721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics