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Simultaneous observations of reconnection pulses at Cluster and their effects on the cusp aurora observed at the Chinese Yellow River Station

【标题】Simultaneous observations of reconnection pulses at Cluster and their effects on the cusp aurora observed at the Chinese Yellow River Station

【Title】Simultaneous observations of reconnection pulses at Cluster and their effects on the cusp aurora observed at the Chinese Yellow River Station

【DOI】10.1029/2010JA015526

【作者】 张清和; 刘瑞源; 胡红桥; 胡泽骏; 张北辰; 韩德胜; 刘顺林

【Author】 Zhang Qinghe ; Liu Ruiyuan ; Hu Hongqiao ; Hu Zejun ; Zhang Beichen ; Han Desheng ; Liu Shunlin

【期刊】JOURNAL OF GEOPHYSICAL RESEARCH

【Journal】JOURNAL OF GEOPHYSICAL RESEARCH

【期刊年份】2010

【卷】115

【期】A10237

【关键词】 flux transfer event (FTE); cusp aurora; poleward-moving auroral forms (PMAFs)

【Keywords】 flux transfer event (FTE); cusp aurora; poleward-moving auroral forms (PMAFs)

【摘要】While the Cluster spacecraft were located near the high-latitude magnetopause, between 1010 and 1040 UT on 16 January 2004, three typical flux transfer event (FTE) signatures were observed. During this interval, simultaneous and conjugated all-sky camera measurements, recorded at Yellow River Station, Svalbard, are available at 630.0 and 557.7 nm that show poleward-moving auroral forms (PMAFs), consistent with magnetic reconnection at the dayside magnetopause. Simultaneous FTEs seen at the magnetopause mainly move northward, but having duskward (eastward) and tailward velocity components, roughly consistent with the observed direction of motion of the PMAFs in all-sky images. Between the PMAFs meridional keograms, extracted from the all-sky images, show intervals of lower intensity aurora which migrate equatorward just before the PMAFs intensify. This is strong evidence for an equatorward eroding and poleward moving open-closed boundary associated with a variable magnetopause reconnection rate under variable IMF conditions. From the durations of the PMAFs, we infer that the evolution time of FTEs is 5–11 minutes from its origin on the magnetopause to its addition to the polar cap.

【Abstract】While the Cluster spacecraft were located near the high-latitude magnetopause, between 1010 and 1040 UT on 16 January 2004, three typical flux transfer event (FTE) signatures were observed. During this interval, simultaneous and conjugated all-sky camera measurements, recorded at Yellow River Station, Svalbard, are available at 630.0 and 557.7 nm that show poleward-moving auroral forms (PMAFs), consistent with magnetic reconnection at the dayside magnetopause. Simultaneous FTEs seen at the magnetopause mainly move northward, but having duskward (eastward) and tailward velocity components, roughly consistent with the observed direction of motion of the PMAFs in all-sky images. Between the PMAFs meridional keograms, extracted from the all-sky images, show intervals of lower intensity aurora which migrate equatorward just before the PMAFs intensify. This is strong evidence for an equatorward eroding and poleward moving open-closed boundary associated with a variable magnetopause reconnection rate under variable IMF conditions. From the durations of the PMAFs, we infer that the evolution time of FTEs is 5–11 minutes from its origin on the magnetopause to its addition to the polar cap.

【基金/项目】 Chinese Academy of Sciences (CAS)(Grant No. 2009S1‐54) ; STFC grant ST/H002480/1 ; 2010年极地优秀论文二等奖 ; 极区能量沉积过程及其对120E子午面电离层影响的研究 ; 午后极光亮斑的可见光特征及其南北极对比研究 ; 日侧冕状极光的分类及其产生机制研究 ; 极隙区空间天气现报和预报模式研究

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