摘要 :
The wave-particle interaction is an important candidate for the energy coupling between the inner magnetosphere and ionosphere in plasmaspheric plumes. In this report, we show our recent progress in wave-particle interaction and p...
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The wave-particle interaction is an important candidate for the energy coupling between the inner magnetosphere and ionosphere in plasmaspheric plumes. In this report, we show our recent progress in wave-particle interaction and precipitating energetic ions/electrons in plasmaspheric plumes with conjugate observations of satellites and ground-based instruments. A direct proof has been shown that electromagnetic ion cyclotron (EMIC) waves can be generated in the plasmaspheric plume and scatter RC ions to cause subauroral proton arcs. Both EMIC waves and extremely low frequency (ELF) hiss were simultaneously observed in the plasmaspheric plume. In the region where the EMIC waves were observed, the pitch angle distribution of ions becomes more isotropic, likely due to the pitch angle scattering by the EMIC waves. It is shown that the ELF hiss and EMIC waves are spatially separated: the ELF hiss is located in the vicinity of the electron density peak within the plume while the EMIC waves are detected in the outer boundary of the plume because of the different propagation characteristics of the ELF hiss and EMIC waves. As a result, the peak of precipitating electron flux was equatorward to that of precipitating proton flux at ionospheric altitudes. In addition, we have also presented characteristic of precipitating ring current (RC) ions/electrons and precipitating radiation belt electrons associated with wave-particle interactions in the plasmaspheric plume.
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