Magnetospheric Signatures of STEVE: Implications for the Magnetospheric Energy Source and Interhemispheric Conjugacy
Magnetospheric Signatures of STEVE: Implications for the Magnetospheric Energy Source and Interhemispheric Conjugacy
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史蒂夫的磁层特征：对磁层能源和半球间共轭的影响
DOI：
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发表时间：
2019
影响因子：
5.2
通讯作者：
R. Raybell
中科院分区：
文献类型：
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作者：
Y. Nishimura;B. Gallardo‐Lacourt;Y. Zou;E. Mishin;D. Knudsen;E. Donovan;V. Angelopoulos;R. Raybell
我们结合磁层中的事件时空历史与宏观相互作用（THEMIS）以及电离层中的国防气象卫星计划（DMSP）和蜂群卫星，介绍了三个STEVE（强热发射速度增强）事件，用于确定STEVE紫色/紫红色弧和栅栏型结构在赤道和两半球间的特征。这两种类型的STEVE发射都与亚极光离子漂移（SAID）、电子加热和等离子体波有关。磁层观测显示，在等离子体层外侧存在结构化的电子、流动以及波（可能是阿尔文波、磁声波或低混杂波）。有趣的是，具有栅栏型结构的事件有一个与电子等离子体片分离的>~1 keV电子结构、向上的场向电流（FACs）以及共轭半球的紫外线发射，而只有紫红色弧的事件没有降水或紫外线发射。我们认为电子降水驱动了栅栏型结构，而加热作为热发射驱动了紫红色弧。
We present three STEVE (strong thermal emission velocity enhancement) events in conjunction with Time History of Events and Macroscale Interactions (THEMIS) in the magnetosphere and Defense Meteorological Satellite Program (DMSP) and Swarm in the ionosphere, for determining equatorial and interhemispheric signatures of the STEVE purple/mauve arc and picket fence. Both types of STEVE emissions are associated with subauroral ion drifts (SAID), electron heating, and plasma waves. The magnetosphere observations show structured electrons and flows and waves (likely kinetic Alfven, magnetosonic, or lower‐hybrid waves) just outside the plasmasphere. Interestingly, the event with the picket fence had a >~1 keV electron structure detached from the electron plasma sheet, upward field‐aligned currents (FACs), and ultraviolet emissions in the conjugate hemisphere, while the event with only the mauve arc did not have precipitation or ultraviolet emission. We suggest that the electron precipitation drives the picket fence, and heating drives the mauve as thermal emission.
关于史蒂夫的起源：粒子降水还是电离层天辉？
影响因子：
5.2
作者：
Gallardo-Lacourt, B.;Liang, J.;Nishimura, Y.;Donovan, E.
通讯作者：
Donovan, E.