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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Generation of Subauroral Longitudinally Extended Emissions Following Intensifications of the Poleward Boundary of the Substorm Bulge and Streamer Production
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Generation of Subauroral Longitudinally Extended Emissions Following Intensifications of the Poleward Boundary of the Substorm Bulge and Streamer Production

机译：代Subauroral纵向扩展强化后的排放向极亚暴隆起和边界拖缆生产

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摘要

Observations showing the development of Subauroral Longitudinally Extended Emigerssions on a global scale are presented. It is demonstrated that they occur as a separation of an eastwest arc-like band of luminosity that detaches away from the equatorward edge of the auroral distribution following episodes of auroral streamer production. They persist for time intervals on the order of ~30 min and devolve into patchy disjointed segments before they fade. Emissions are seen in both 557.7 nm OI and 391.4 nm N_~+2 1NG lines, and 630.0 nm emissions are often observed equatorward. The 391.4 nm emissions are typically weaker and fade away more quickly than the 557.7 nm emissions, suggesting that an auroral precipitation source is initially present but is rapidly depleted as the forms age. All cases are associated with enhanced Subauroral Polarization Stream (SAPS) flows, and one event shows clear association with large-scale Giant Undulations (GUs) and the formation of spur-like forms that fold equatorward under the main oval. A model is proposed for the production of subauroral longitudinally extended forms in which nonlinear growth of SAPS-induced surface waves on the plasmapause results in a disruption of the boundary. It is suggested that hot plasma of plasma sheet origin becomes entrained in the plasmasphere to produce transient precipitation-associated auroral emissions that may decay into STEVE emissions and that cold dense plasma from the plasmasphere becomes entrained onto open drift paths to feed long-lived drainage plumes. This process may occur quasi periodically during intense substorms and storm-time conditions.
机译：观察显示Subauroral的发展纵向扩展Emigerssions全球规模。发生在东西方arc-like分离带分离距离的光度朝赤道方向极光的边缘分布在极光幕生产。的顺序~ 30分钟,下放到参差不齐支离破碎的片段才消失。都在557.7 nm OI和391.4 nm N_ ~ + 21 ng行,630.0 nm经常排放观察到的阻碍。通常较弱,消失得更快557.7 nm排放,这表明一个极光降水最初来源是礼物但正在迅速枯竭的形成年龄。例与增强Subauroral相关联极化流(SAPS)流,一个事件显示清楚协会与大规模的巨人起伏(格斯)和spur-like的形成形式下折叠朝赤道方向主要椭圆形。提出了一个模型的生产subauroral纵向扩展的形式SAPS-induced表面波的非线性增长等离子体层顶结果的干扰边界。等离子体片来源变得越来越大等离子体层产生瞬态precipitation-associated极光排放可能会衰变为史蒂夫排放,冷吗从等离子体层变得稠密等离子体携入的喂到开放的漂移路径长寿排水羽流。发生在强烈的亚暴的准周期性和storm-time条件。

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