دورية أكاديمية
Effects of polarization-reversed electromagnetic ion cyclotron waves on the ring current dynamics
العنوان: | Effects of polarization-reversed electromagnetic ion cyclotron waves on the ring current dynamics |
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المؤلفون: | MingHui Zhu, YiQun Yu, Xing Cao, BinBin Ni, XingBin Tian, JinBin Cao, Vania K. Jordanova |
المصدر: | Earth and Planetary Physics, Vol 6, Iss 4, Pp 329-338 (2022) |
بيانات النشر: | Science Press, 2022. |
سنة النشر: | 2022 |
المجموعة: | LCC:Science LCC:Geophysics. Cosmic physics LCC:Environmental sciences |
مصطلحات موضوعية: | electromagnetic ion cyclotron waves, polarization reversal, ring current, Science, Geophysics. Cosmic physics, QC801-809, Environmental sciences, GE1-350 |
الوصف: | 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. |
نوع الوثيقة: | article |
وصف الملف: | electronic resource |
اللغة: | English |
تدمد: | 2096-3955 |
العلاقة: | https://doaj.org/toc/2096-3955Test |
DOI: | 10.26464/epp2022037?pageType=en |
DOI: | 10.26464/epp2022037 |
الوصول الحر: | https://doaj.org/article/6df6ffa128984a828f6ab0b6c19edec9Test |
رقم الانضمام: | edsdoj.6df6ffa128984a828f6ab0b6c19edec9 |
قاعدة البيانات: | Directory of Open Access Journals |
تدمد: | 20963955 |
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DOI: | 10.26464/epp2022037?pageType=en |