Citation:
Zhu, M. H., Yu, Y. Q., Cao, X., Ni, B. B., Tian, X. B., Cao, J. B., and Jordanova, V. K. (2022). Effects of polarization-reversed electromagnetic ion cyclotron waves on the ring current dynamics. Earth Planet. Phys., 6(4), 329–338. http://doi.org/10.26464/epp2022037
2022, 6(4): 329-338. doi: 10.26464/epp2022037
Effects of polarization-reversed electromagnetic ion cyclotron waves on the ring current dynamics
| 1. | School of Space and Environment, Beihang University, Beijing 100191, China |
| 2. | Key Laboratory of Space Environment Monitoring and Information Processing, Ministry of Industry and Information Technology, Beijing 100191, China |
| 3. | Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China |
| 4. | Chinese Academy of Sciences Center for Excellence in Comparative Planetology, Hefei 230026, China |
| 5. | Space Science and Application, Los Alamos National Laboratory, Los Alamos, 87545, New Mexico, USA |
Electromagnetic ion cyclotron (EMIC) waves are widely believed to play an important role in influencing the radiation belt and ring current dynamics. Most studies have investigated the effects or characteristics of EMIC waves by assuming their left-handed polarization. However, recent studies have found that the reversal of polarization, which occurs at higher latitudes along the wave propagation path, can change the wave-induced pitch angle diffusion coefficients. Whether such a polarization reversal can influence the global ring current dynamics remains unknown. In this study, we investigate the ring current dynamics and proton precipitation loss in association with polarization-reversed EMIC waves by using the ring current–atmosphere interactions model (RAM). The results indicate that the polarization reversal of H-band EMIC waves can truly decrease the scattering rates of protons of 10 to 50 keV or >100 keV in comparison with the scenario in which the EMIC waves are considered purely left-handed polarized. Additionally, the global ring current intensity and proton precipitation may be slightly affected by the polarization reversal, especially during prestorm time and the recovery phase, but the effects are not large during the main phase. This is probably because the H-band EMIC waves contribute to the proton scattering loss primarily at E < 10 keV, an energy range that is not strongly affected by the polarization reversal.
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