Correlations Between Dispersive Alfvén Wave Activity, Electron Energization, and Ion Outflow in the Inner Magnetosphere

Correlations Between Dispersive Alfvén Wave Activity, Electron Energization, and Ion Outflow in the Inner Magnetosphere
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内磁层中色散阿尔文波活动、电子能量和离子流出之间的相关性

DOI:
10.1029/2020gl088985
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发表时间:
2020
影响因子:
5.2
通讯作者:
Reeves, G. D.
Reeves, G. D.
中科院分区:
地球科学1区
文献类型:
--
作者:
Hull, A. J.;Chaston, C. C.;Bonnell, J. W.;Damiano, P. A.;Wygant, J. R.;Reeves, G. D.

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使用范艾伦探测器的测量结果,我们表明,在活跃条件下,由色散阿尔文波(DAW)激发的场对准电子通量在内部磁层中很突出。这些电子优先具有 1.2 至 2 的场排列各向异性,能量范围从几十电子伏到几千电子伏 (keV),最大值与磁场偶极化一致。比较表明,DAW 能量密度和坡印廷通量与沉淀电子能量和能量通量以及 O+ 离子流出能量密切相关。这些观察结果产生了 DAW 和电子输入与 O+离子流出响应之间的经验内磁层关系,为模型提供了重要的约束。他们还表明,DAW 在增强场对准电子输入电离层方面发挥着重要作用,从而促进波场中 O+ 离子流出并随后激发到内磁层。
Using measurements from the Van Allen Probes, we show that field‐aligned fluxes of electrons energized by dispersive Alfvén waves (DAWs) are prominent in the inner magnetosphere during active conditions. These electrons have preferentially field‐aligned anisotropies from 1.2 to2 at energies ranging from tens of electron volts to several kiloelectron volts (keV), with largest values being coincident with magnetic field dipolarizations. Comparisons reveal that DAW energy densities and Poynting fluxes are strongly correlated with precipitating electron energies and energy fluxes and also O+ion outflow energies. These observations yield empirical inner magnetosphere relations between the DAW and electron inputs and the O+ion outflow response, providing important constraints for models. They also suggest that DAWs play an important role in enhancing field‐aligned electron input into the ionosphere that facilitates the outflow and subsequent energization of O+ions in the wave fields into the inner magnetosphere.
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发表时间: 2014-01
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DOI: 10.1029/169gm16
发表时间: 2013
期刊: Geophysical monograph
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