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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Malti-instrument observations of soft electron precipitation and its ociation with magnetospheric flows
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Malti-instrument observations of soft electron precipitation and its ociation with magnetospheric flows

机译：Malti-instrument观察软电子降水及其协会磁性层的流

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摘要

We present a multi-instrument study on the variations of optical auroras and pnospheric electron densities during an interval of a series of fast earthward flows in the nagnetotail on 3 March 2009. The flow-related auroral signatures include intermittent nigher-latitude (>68° magnetic latitude) intensifications manifested in green and blue line uroras and more latitudinally extended red line auroral intensifications and expansions. Ouring the same interval the Poker Flat incoherent scatter radar (PFISR) detected F region pnospheric electron density enhancements which, together with the red line auroral mtensifications, give evidence for soft electron (<1 keV) precipitation associated with fast nagnetospheric flow activity. We demonstrated the southward motion of ionospheric lectron density patches in correspondence to individual earthward flow bursts and auroral activations. By virtue of the multibeam technique of PFISR we construct the altitudinal rofile of the density patches and estimate that the characteristic energies of the recipitating electrons were on order of a few hundred eV, comparable to the observed lectron temperature in the near-Earth central plasma sheet (CPS). We propose that the 1st flows give rise to enhanced ELF wave activity, which causes strong pitch angle iffusion of the soft electron population in the CPS via wave-particle interactions. The recipitation may be further aided with a moderate field-aligned potential drop comparable to or smaller than the CPS electron temperature. When the flows penetrate into the inner plasma sheet, the adiabatic drift motion of soft electrons may lead to a decreasing trend of electron energy with decreasing radial distance, which is manifested in PFISR observations as an ascending trend of the altitude range of the density patches toward the equatorward auroral border.
机译：我们现在multi-instrument研究光学极光和pnospheric变化电子密度在一系列的间隔快速的向地面流动在nagnetotail 32009年3月。包括间歇性nigher-latitude(> 68°磁纬度)强化表现绿色和蓝色线uroras和更多的纬度红线极光强化和扩展扩张。平的非相干散射雷达(PFISR)检测到F地区pnospheric电子密度增强一起,红线极光吗mtensifications,给软电子证据(< 1 keV)降水与快nagnetospheric流活动。向南运动电离层lectron密度补丁在对应个人向地面流脉冲和极光激活。我们构建的多波束技术PFISR高度的rofile补丁和密度估计的能量特征recipitating电子订购一些几百eV,观察lectron可比近地中央等离子体温度表(CPS)。增强的ELF波活动,导致强大的螺旋角的iffusion软电子通过波粒CPS人口交互。辅助与温和field-aligned潜力与或小于CPS下降电子温度。内等离子体片,绝热漂移软电子的运动可能导致下降电子能量和减少径向的趋势距离,在PFISR体现观察作为一个提升的趋势高度范围向密度的补丁朝赤道方向极光边界。

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