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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Electron precipitation from EMIC waves: A case study from 31 May 2013
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Electron precipitation from EMIC waves: A case study from 31 May 2013

机译：电子从波位的降水:一个案例研究从2013年5月31日

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摘要

On 31 May 2013 several rising tone electromagnetic ion cyclotron (EMIC) waves with intervals of pulsations of diminishing periods were observed in the magnetic local time afternoon and evening sectors during the onset of a moderate/large geomagnetic storm. The waves were sequentially observed in Finland, Antarctica, and western Canada. Coincident electron precipitation by a network of ground-based Antarctic Arctic Radiation-belt Dynamic Deposition VLF Atmospheric Research Konsortia and riometer instruments, as well as the Polar-orbiting Operational Environmental Satellite (POES) electron telescopes, was also observed. At the same time, POES detected 30–80 keV proton precipitation drifting westward at locations that were consistent with the ground-based observations, indicating substorm injection. Through detailed modeling of the combination of ground and satellite observations, the characteristics of the EMIC-induced electron precipitation were identified as latitudinal width of 2–3° or ΔL=1Re, longitudinal width ~50° or 3 h magnetic local time, lower cutoff energy 280 keV, typical flux 1 × 10~4 el cm~(-2) sr~(-1) s~(-1)>300 keV. The lower cutoff energy of themost clearly defined EMIC rising tone in this study confirms the identification of a class of EMIC-induced precipitation events with unexpectedly low-energy cutoffs of <400 keV.
机译：2013年5月31日几个阳平电磁离子回旋波(位)的时间间隔脉动递减时间观察在磁当地时间下午和晚上在出现中度/大部门地磁风暴。观察到在芬兰,南极洲,西方加拿大。南极北极的地面网络动态沉积甚低频大气辐射带研究Konsortia和宇宙噪声测量器工具极轨操作环境卫星(po)电子望远镜,也观察到。坡发现30 - 80 keV质子降水向西漂移的位置与地面观测结果一致,指示亚暴注入。地面和组合的建模卫星观测的特点EMIC-induced电子降水2 - 3°或确认为纬度的宽度ΔL = 1再保险,纵向宽度~ 50°或3 h磁当地时间,降低截止280 keV能量,典型通量1×10 ~ 4 el厘米~老(2)~ (1)~ (1)> 300 keV。的低截止能量最清楚定义位的阳平在这项研究证实EMIC-induced类的识别降水事件意外低能切断< 400 keV。

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