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An improved dispersion relation for parallel propagating electromagnetic waves in warm plasmas: Application to electron scattering

Chen L., R. M. Thorne, Y. Shprits, B. Ni, (2013), An improved dispersion relation for parallel propagating electromagnetic waves in warm plasmas: Application to electron scattering, J. of Geophys. Res. [Space Physics], 118, 2185-2195, doi:10.1002/jgra.50260

Abstract

AbstractAn improved dispersion relation, with thermal corrections retained, for parallel propagating electromagnetic waves in a warm plasma is developed for both left‒hand (L‒) and right‒hand (R‒) polarized modes. Compared with the cold plasma dispersion relation, the derived dispersion relation is in much better agreement with the full hot plasma dispersion relation (including the wave growth rate). The pitch angle scattering rates of energetic electrons are compared between using cold and full dispersion relation. Significant differences are found when evaluating pitch angle scattering rate of MeV electron caused by He+ band waves in multiple ion plasmas. Due to He+ ion cyclotron absorption, the He+band electromagnetic ion cyclotron waves, which are able to resonate with MeV electrons (at large wave number), tend to be strongly suppressed. Less significant differences in scattering rate of electrons between using cold and hot dispersion relation are found in the case of L‒mode waves in single H+ ion plasma and in the case of R‒mode waves.

Authors (sorted by name)

Chen Ni Shprits Thorne

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Acknowledgments

This research was supported by the NASA grant NNX11AR64G. YYS would like to acknowledge support of NASA grants NNX09AF51G and NNX10AK996. We thank Peter Gary and Kaijun Liu for their helpful discussion in the course of this study.

Grants

NNX09AF51G NNX10AK996 NNX11AR64G

Bibtex

@article{doi:10.1002/jgra.50260,
author = {Chen, Lunjin and Thorne, Richard M. and Shprits, Yuri and Ni, Binbin},
title = {An improved dispersion relation for parallel propagating electromagnetic waves in warm plasmas: Application to electron scattering},
journal = {Journal of Geophysical Research: Space Physics},
year = {2013},
volume = {118},
number = {5},
pages = {2185-2195},
keywords = {plasma waves, warm plasma, instability, wave particle interaction, electromagnetic ion cyclotron waves, whistler mode waves},
doi = {10.1002/jgra.50260},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/jgra.50260},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/jgra.50260},
abstract = {AbstractAn improved dispersion relation, with thermal corrections retained, for parallel propagating electromagnetic waves in a warm plasma is developed for both left‒hand (L‒) and right‒hand (R‒) polarized modes. Compared with the cold plasma dispersion relation, the derived dispersion relation is in much better agreement with the full hot plasma dispersion relation (including the wave growth rate). The pitch angle scattering rates of energetic electrons are compared between using cold and full dispersion relation. Significant differences are found when evaluating pitch angle scattering rate of MeV electron caused by He+ band waves in multiple ion plasmas. Due to He+ ion cyclotron absorption, the He+band electromagnetic ion cyclotron waves, which are able to resonate with MeV electrons (at large wave number), tend to be strongly suppressed. Less significant differences in scattering rate of electrons between using cold and hot dispersion relation are found in the case of L‒mode waves in single H+ ion plasma and in the case of R‒mode waves.}
}