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- Title
Variation of Electron Lifetime Due To Scattering by Electrostatic Electron Cyclotron Harmonic Waves in the Inner Magnetosphere With Electron Distribution Parameters.
- Authors
Stoll, Katja; Pick, Leonie; Wang, Dedong; Cao, Xing; Ni, Binbin; Shprits, Yuri
- Abstract
Through resonant wave‐particle interactions with electrostatic electron cyclotron harmonic (ECH) waves, low‐energy plasma sheet electrons can be scattered into the atmospheric loss cone and precipitate. This process can be investigated by calculating bounce‐averaged quasi‐linear diffusion coefficients. However, the numerical calculation of ECH wave‐induced scattering rates requires the specification of several parameters, including the properties of the hot plasma sheet electrons responsible for the wave excitation. The dependence of the diffusion coefficients on these parameters and the exact contribution of scattering by ECH waves to diffuse auroral precipitation is still poorly understood and has not been carefully quantified yet. In this study, we calculate bounce‐averaged quasi‐linear scattering rates and compare the resulting lifetimes to the strong diffusion limit. We vary the temperature, plasma density, and loss cone parameters of the hot component in the electron loss cone distribution over a large range based on previous studies and observations. By adopting a new model that derives the wave normal angle from the midpoint and the angular width of the growth rate profile, our findings suggest that the electron lifetime near the loss cone is not significantly affected by the hot electron temperature and loss cone parameters. However, there is an increase in electron lifetimes with increasing plasma density. For an electric field amplitude of 1 mV/m, the electron lifetime is below or equal to the lifetime calculated using the strong diffusion limit up to E = 0.25 keV when n = 1.5 cm−3, and up to E = 0.22 keV when n = 9 cm−3. Key Points: Plasma density has the greatest impact on electron loss among the tested parametersIncreasing trend in electron lifetimes with plasma density which becomes more pronounced at higher electron energiesResults depend crucially on adapted wave normal angle model which represents growth rate profile more consistently than in previous works
- Subjects
ELECTRON distribution; ELECTRON density; HOT carriers; MAGNETOSPHERE; PLASMA density; ELECTRON diffusion; ELECTRONS; ELECTRON scattering
- Publication
Journal of Geophysical Research. Space Physics, 2023, Vol 128, Issue 12, p1
- ISSN
2169-9380
- Publication type
Article
- DOI
10.1029/2023JA031803