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Effect of Hot He + Ions on the Electron Pitch Angle Scattering Driven by H + , He + , and O + Band EMIC Waves
Author(s) -
Yu J.,
Li L. Y.,
Cui J.,
Cao J. B.,
Wang J.
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl083456
Subject(s) - pitch angle , scattering , electron , atomic physics , ion , emic and etic , physics , anisotropy , electron scattering , optics , nuclear physics , quantum mechanics , geophysics , sociology , anthropology
In this paper, we find that hot He + ions significantly alter the kinetic dispersion relation of electromagnetic ion cyclotron (EMIC) waves and thus strongly affect the wave‐driven electron pitch angle scattering rates. Increasing hot He + ion parallel temperature, temperature anisotropy, or abundance raises the pitch angle scattering rates of MeV electrons driven by the H + band EMIC waves. During the electron resonance with the He + and O + band EMIC waves, the electron pitch angle scattering rates are more sensitive to the variation of temperature anisotropy and abundance of hot He + ions than their parallel temperature. The increase of hot He + ion abundance (temperature anisotropy or abundance) generates a reduction of the energy range of electrons interacting with the He + (O + ) band EMIC waves. Therefore, the effect of hot He + ions on the EMIC wave‐driven electron pitch angle scattering should be involved in the radiation belt modeling.