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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Refilling of the slot region between the inner and outer electron radiation belts during geomagnetic storms
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Refilling of the slot region between the inner and outer electron radiation belts during geomagnetic storms

机译：更新内部和之间的槽区域外电子在地磁辐射带风暴

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Energetic electrons (≥50 keV) are injected into the slot region (2 < L < 4) between the inner and outer radiation belts during the early recovery phase of geomagnetic storms. Enhanced convection from the plasma sheet can account for the storm-time injection at lower energies but does not explain the rapid appearance of higher-energy electrons (≥150 keV). The effectiveness of either radial diffusion (driven by enhanced ULF waves) or local acceleration (during interactions with enhanced whistler mode chorus emissions), as a potential source for refilling the slot at higher energies, is analyzed for observed conditions during the early recovery phase of the 10 October 1990 storm. We demonstrate that local acceleration, driven by observed chorus emissions, can account for the rapid enhancement in 200–700 keV electrons in the outer slot region near L = 3.3. Radial diffusion is much less effective but may partially contribute to the flux enhancement at lower L. Subsequent outward expansion of the plasmapause during the storm recovery phase effectively terminates local wave acceleration in the slot and prevents acceleration to energies higher than ～700 keV. A statistical analysis of energetic electron flux enhancements and wave and plasma properties over the entire CRRES mission supports the concept of local wave acceleration as a dominant process for refilling the slot during the main and early recovery phase of storms. For moderate storms, the injection process naturally becomes less effective at energies ≥1 MeV, due to the longer wave acceleration times and additional precipitation loss from scattering by electromagnetic ion cyclotron waves. However, during extreme events when the plasmapause remains compressed for several days, conditions may occur to allow wave acceleration to multi-MeV energies at locations normally associated with the slot.
机译：高能电子(≥50 keV)注入槽区域(2 < L < 4)在内部和之间在早期恢复外辐射带阶段的地磁风暴。从等离子体片可以考虑较低的能量,但是storm-time注入不能解释的迅速出现的高能电子(≥150 keV)。径向扩散(由增强的ULF波)或当地加速度(在交互增强的惠斯勒模式合唱排放),作为一个填充槽在更高的潜在来源能量,分析了观测条件在10月10日的早期恢复阶段1990年风暴。加速度,由观察到合唱排放,可以迅速增强在200 - 700 keV电子外槽地区L = 3.3附近。有效但可能部分贡献通量增强低l .随后向外扩张的等离子体层顶在暴风雨中恢复阶段有效地终止当地波槽,防止加速加速比~ 700 keV能量高。高能电子通量的统计分析增强和波和等离子体特性整个crr任务支持的概念当地波加速度作为占主导地位的过程在主要和邻桌的槽风暴的复苏阶段。注射过程中自然变得更少有效的能量≥1兆电子伏,由于时间越长波加速时间和额外的降水的散射损失电磁离子回旋波。在等离子体层顶时的极端事件仍然是压缩了好几天,条件允许波加速度multi-MeV可能发生吗通常与能量的位置槽。

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