Polarization jet events and excitation of weak SAR arcs
Polarization jet events and excitation of weak SAR arcs
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极化射流事件和弱合成孔径雷达弧的激发
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. Mendillo
中科院分区：
文献类型：
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作者：
S. Sazykin;B. Fejer;Y. Galperin;L. Zinin;S. A. Grigoriev;M. Mendillo
极化喷流（PJ），也称为亚极光离子漂移（SAID），是在傍晚和夜间时段弥散极光向赤道边缘的超音速向西等离子体漂移。它们在F区的光学特征是与快速对流区域共位的微弱的630.0纳米红色弧。这些微弱的弧类似于在磁暴恢复阶段观测到的稳定极光红（SAR）弧，但强度更低，寿命更短，并且在没有来自磁层的显著热通量的情况下出现。先前的模型研究低估了微弱SAR弧的亮度。我们提出的计算表明，极化喷流事件期间的离子 - 中性粒子碰撞加热和离子成分变化可能是630.0纳米辐射的一个额外来源，并提出了可以验证我们建模结果的实验测试。
Polarization Jet (PJ), also known as Sub‐Auroral Ion Drift (SAID), events are supersonic westward plasma drifts on the equatorward edge of the diffuse aurora in the evening and nighttime sector. Their optical F‐region signatures are weak 630.0 nm red arcs colocated with regions of fast convection. These weak arcs resemble Stable Auroral Red (SAR) arcs observed during the recovery phase of magnetic storms, but have lower intensities, shorter lifetimes, and occur without a significant heat flux from the magnetosphere. Previous model studies underestimated the brightness of weak SAR arcs. We present calculations showing that ion‐neutral collisional heating and ion composition changes during PJ events may be an additional source of 630.0 nm emission, and propose experimental tests that could verify our modeling results.