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Effects of polarization-reversed electromagnetic ion cyclotron waves on the ring current dynamics

Earth and Planetary Physics 2022年第4期6卷 329-338页

作者： MingHui Zhu YiQun Yu Xing Cao BinBin Ni XingBin Tian JinBin Cao vania k.jordanova School of Space and Environment Beihang UniversityBeijing 100191China key Laboratory of Space Environment Monitoring and Information Processing Ministry of Industry and Information TechnologyBeijing 100191China Department of Space Physics School of Electronic InformationWuhan UniversityWuhan 430072China Chinese Academy of Sciences Center for Excellence in Comparative Planetology Hefei 230026China Space Science and Application Los Alamos National LaboratoryLos Alamos87545New MexicoUSA

Electromagnetic ion cyclotron(EMIC)waves are widely believed to play an important role in influencing the radiation belt and ring current *** studies have investigated the effects or characteristics of EMIC waves by assuming their left-handed ***,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 *** such a polarization reversal can influence the global ring current dynamics remains *** 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 ***,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 *** is probably because the H-band EMIC waves contribute to the proton scattering loss primarily at EkeV,an energy range that is not strongly affected by the polarization reversal.

关键词： electromagnetic ion cyclotron waves polarization reversal ring current

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