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Latitudinal dependence of nonlinear interaction between electromagnetic ion cyclotron wave and radiation belt relativistic electrons

Su Z., H. Zhu, F. Xiao, H. Zheng, C. Shen, Y. Wang, S. Wang, (2013), Latitudinal dependence of nonlinear interaction between electromagnetic ion cyclotron wave and radiation belt relativistic electrons, J. of Geophys. Res. [Space Physics], 118, 3188-3202, doi:10.1002/jgra.50289

Abstract

Electromagnetic ion cyclotron (EMIC) waves are long suggested to account for the rapid loss of radiation belt relativistic electrons. Here we perform both theoretical analysis and numerical simulation to comprehensively investigate the nonlinear interaction between EMIC wave and relativistic electrons. In particular, we emphasize the dependence of nonlinear processes on the electron initial latitude. The nonlinear phase trapping yields negative equatorial pitch angle transport, with efficiency varying over the electron initial latitude, implying that it can increase the loss rate predicted by quasilinear theory. The nonlinear channel effect phase bunching produces positive equatorial pitch angle transport, less dependent on the electron initial latitude, suggesting that it can decrease the loss rate predicted by quasilinear theory. The nonlinear cluster effect phase bunching alternately causes positive and negative equatorial pitch angle transport, quasi-periodically dependent on the electron initial latitude, suggesting that it can either decrease or increase the loss rate predicted by the quasilinear theory. Such latitudinal dependence of nonlinear processes should be taken into account in the evaluation of radiation belt electron loss rate driven by EMIC waves.

Authors (sorted by name)

Shen Su Xiao Zheng Zhu

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Acknowledgments

This work was supported by the National Natural Science Foundation of China grants 41274169, 41274174, 41174125, 41131065, 41121003, and 41074120, the Chinese Academy of Sciences grant KZCX2‐EW‐QN510 and KZZD‐EW‐01‐4, the National Key Basic Research Special Foundation of China Grant 2011CB811403, and the Fundamental Research Funds for the Central Universities WK2080000031.

Bibtex

@article{doi:10.1002/jgra.50289,
author = {Su, Zhenpeng and Zhu, Hui and Xiao, Fuliang and Zheng, Huinan and Shen, Chao and Wang, Yuming and Wang, Shui},
title = {Latitudinal dependence of nonlinear interaction between electromagnetic ion cyclotron wave and radiation belt relativistic electrons},
journal = {Journal of Geophysical Research: Space Physics},
year = {2013},
volume = {118},
number = {6},
pages = {3188-3202},
keywords = {radiation belt electrons, precipitation loss, wave-particle interaction, EMIC wave, phase trapping, phase bunching},
doi = {10.1002/jgra.50289},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/jgra.50289},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/jgra.50289},
abstract = {Electromagnetic ion cyclotron (EMIC) waves are long suggested to account for the rapid loss of radiation belt relativistic electrons. Here we perform both theoretical analysis and numerical simulation to comprehensively investigate the nonlinear interaction between EMIC wave and relativistic electrons. In particular, we emphasize the dependence of nonlinear processes on the electron initial latitude. The nonlinear phase trapping yields negative equatorial pitch angle transport, with efficiency varying over the electron initial latitude, implying that it can increase the loss rate predicted by quasilinear theory. The nonlinear channel effect phase bunching produces positive equatorial pitch angle transport, less dependent on the electron initial latitude, suggesting that it can decrease the loss rate predicted by quasilinear theory. The nonlinear cluster effect phase bunching alternately causes positive and negative equatorial pitch angle transport, quasi-periodically dependent on the electron initial latitude, suggesting that it can either decrease or increase the loss rate predicted by the quasilinear theory. Such latitudinal dependence of nonlinear processes should be taken into account in the evaluation of radiation belt electron loss rate driven by EMIC waves.}
}