首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Multi-Event Analysis of Plasma and Field Variations in Source of Stable Auroral Red (SAR) Arcs in Inner Magnetosphere During Non-Storm-Time Substorms
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Multi-Event Analysis of Plasma and Field Variations in Source of Stable Auroral Red (SAR) Arcs in Inner Magnetosphere During Non-Storm-Time Substorms

机译:的多事件分析等离子体和字段变化的来源稳定的红色极光(SAR)弧在Non-Storm-Time内部磁气圈亚暴的

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摘要

Stable auroral red (SAR) arcs are optical events with dominant 630.0-nm emission caused by low-energy electron heat flux into the topside ionosphere from the inner magnetosphere. SAR arcs are observed at subauroral latitudes and often occur during the recovery phase of magnetic storms and substorms. Past studies concluded that these low-energy electrons were generated in the spatial overlap region between the outer plasmasphere and ring-current ions and suggested that Coulomb collisions between plasmaspheric electrons and ring-current ions are more feasible for the SAR-arc generation mechanism rather than Landau damping by electromagnetic ion cyclotron waves or kinetic Alfvén waves. This work studies three separate SAR-arc events with conjunctions, using all-sky imagers and inner magnetospheric satellites (Arase and Radiation Belt Storm Probes [RBSP]) during non-storm-time substorms on December 19, 2012 (event 1), January 17, 2015 (event 2), and November 4, 2019 (event 3). We evaluated for the first time the heat flux via Coulomb collision using full-energy-range ion data obtained by the satellites. The electron heat fluxes due to Coulomb collisions reached ~10~9 eV/cm~2/s for events 1 and 2, indicating that Coulomb collisions could have caused the SAR arcs. RBSP-A also observed local enhancements of 7-20-mHz electromagnetic wave power above the SAR arc in event 2. The heat flux for the freshly detached SAR arc in event 3 reached ~10~8 eV/cm~2/s, which is insufficient to have caused the SAR arc. In event 3, local flux enhancement of electrons (<200 eV) and various electromagnetic waves were observed, these are likely to have caused the freshly detached SAR arc.
机译:稳定的红色极光(SAR)弧是光学的事件主导630.0 nm排放造成的低能电子热通量在甲板上电离层的内部磁气圈。经常观察subauroral纬度和吗发生在磁性的复苏阶段风暴和亚暴。这些低能量电子生成的空间之间的重叠区域外等离子体层和环形电流离子和建议库仑plasmaspheric之间的碰撞电子和离子环形电流更可行而不是对SAR-arc一代机制朗道阻尼电磁离子回旋波或动力学阿尔芬波。三个独立SAR-arc事件与连词,使用全天成像仪和内心的磁性层的卫星(Arase和辐射带风暴探测[RBSP])在non-storm-time亚暴2012年12月19日(活动1),2015年1月17日(活动2),2019年11月4日(活动3)。我们热流通过首次评估使用full-energy-range离子库仑碰撞数据通过卫星。热通量由于库仑碰撞~ 10 ~ 9 eV /厘米~ 2 /秒事件1和2,指示库仑碰撞可能导致SAR弧。7-20-mHz电磁波功率高于香港事件2中弧。分离SAR电弧事件3 ~ 10 ~ 8eV /厘米~ 2 /秒,不足以造成特区弧。电子(< 200 eV)和各种电磁波被观察到,这些都是可能造成新分离的SAR弧。

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