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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >On the Ion Precipitation due to Field Line Curvature (FLC) and EMIC Wave Scattering and Their Subsequent Impact on Ionospheric Electrodynamics
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On the Ion Precipitation due to Field Line Curvature (FLC) and EMIC Wave Scattering and Their Subsequent Impact on Ionospheric Electrodynamics

机译：场对离子沉淀线位的波散射和曲率方法他们随后对电离层的影响电动力学

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摘要

Both field line curvature (FLC) and electromagnetic ion cyclotron (EMIC) wave scattering are believed to be associated with energetic ion precipitation, but their relative contributions to ionospheric ion precipitation and subsequent effects are still unclear. In this study, by using a kinetic ring current model, we investigate their impact on the ionosphere from two aspects: the global distribution of ion precipitation and resulting ionospheric conductance. Our results show that the intensity and coverage of ion precipitation due to EMIC waves are larger than that due to FLC scattering, while the latter mostly contributes to ion precipitation in outer regions (L > 4–5). We then estimate the conductance with empirical models using the simulated ion precipitation energy flux. When the EMIC wave associated proton precipitation is included, the conductance is significantly enhanced in the dusk-to-midnight sector and has a wide magnetic latitude (MLAT) range from around 52° to 62°, considerably altering the electric potential in the dusk sector, which further influences particle dynamics in the magnetosphere. On the contrary, the proton precipitation caused by FLC scattering only occurs at higher latitudes above MLAT = 60° and the corresponding conductance is slightly enhanced at midnight, with negligible influence on the convective electric potential. Although electron precipitation-associated conductance is predominant globally, the results show that proton precipitation can also play an important role in ionospheric electrodynamics, especially when EMIC wave-associated precipitating proton energy flux exceeds that of electrons in the dusk sector, a region where many subauroral coupling processes occur.
机译：两个字段(方法)和曲率电磁离子回旋波位的散射被认为是相关的高能离子沉淀,但它们的相对贡献电离层离子沉淀和随后的影响仍不清楚。研究中,通过使用动态环电流模型,我们调查对电离层的影响两个方面:全球分布的离子降水和得到的电离层电导。由于位的和覆盖范围的离子沉淀波比,由于散射方法,而后者主要导致离子外地区的降水(L > 4 - 5)。估计电导与实证模型使用模拟离子沉淀的能量通量。包括降水时,电导dusk-to-midnight显著增强部门和有一个宽磁纬度(MLAT)从52°- 62°左右,很大改变电势的黄昏部门,进一步影响粒子动态磁气圈。质子降水方法造成的散射仅发生在高纬度地区高于MLAT = 60°和相应的电导略增强的午夜,影响可以忽略不计在对流电势。电子precipitation-associated电导主要在全球范围内,结果表明质子降水也可以扮演一个重要的在电离层电动力学作用,特别是当位的波)沉淀质子电子的能量通量超过黄昏部门、地区许多subauroral耦合过程发生。

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