Abstract—

Stable auroral red (SAR) arcs are the result of the interaction of energetic ring current ions with the outer plasmasphere (plasmapause). The article analyzes the results of the observation of a SAR arc by an all-sky imager at Maimaga station (58° CGMLat, 202° CGMLon) with the simultaneous detection of the plasmapause and energetic ion fluxes by the Van Allen Probe B (VAP-B) satellite at the beginning of a large magnetic storm on March 17, 2015. The all-sky imager registered an intense SAR arc at corrected geomagnetic latitudes of 52°–59° in the MLT evening sector, starting from ~1116 UT (1926 MLT), during low auroral activity at IMFBz > 0. According to the VAP-B satellite, the plasmapause was at L ~ 3–4, and the inner boundary of energetic ion fluxes H⁺ and O⁺ was at L ~ 2.8–3.3 near the meridian of optical observations. The DMSP-F19 satellite measured the subauroral electron temperature peaks at 1014 and 1155 UT in the MLT evening sector. It is shown that the SAR arc mapped in this case the overlap region of plasmasphere dusk-bulge by the flux of energetic ring current ions after the beginning of the magnetic storm.

中文翻译：

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2015年3月17日磁暴开始时MLT夜间区域SAR弧的地面和卫星观测

摘要—

稳定的极光红（SAR）电弧是高能环流离子与外部等离子层（plasmapause）相互作用的结果。本文分析了Maimaga站（58°CGMLat，202°CGMLon）上的全天候成像仪对SAR弧的观测结果，同时通过Van Allen Probe B（VAP- B）在2015年3月17日大磁暴开始时的卫星。全天候成像仪在MLT晚间扇区的校正地磁纬度为52°–59°处记录到强烈的SAR弧，从UT〜1116（1926年）开始MLT），在低极光活动期间IMFBz > 0。根据VAP-B卫星，所述等离子体层是在大号〜3-4，并高能离子的内边界通量ħ ⁺和O ⁺是在大号〜2.8-3.3光学观测的子午线的附近。DMSP-F19卫星在MLT晚间扇区测量了1014和1155 UT的耳下电子温度峰值。结果表明，在这种情况下，SAR电弧由磁暴开始后的高能环流离子通量映射出等离子球体黄昏凸起的重叠区域。