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SuperDARN CUTLASS Finland radar observations of highlatitude magnetic reconnections under northward interplanetary magnetic field (IMF) conditions

【标题】SuperDARN CUTLASS Finland radar observations of highlatitude magnetic reconnections under northward interplanetary magnetic field (IMF) conditions

【Title】SuperDARN CUTLASS Finland radar observations of highlatitude magnetic reconnections under northward interplanetary magnetic field (IMF) conditions

【DOI】10.1007/s11431-012-4820-y

【作者】 张清和; 刘瑞源; 杨惠根; 胡红桥; 张北辰

【Author】 Zhang Qinghe ; Liu Ruiyuan ; Yang Huigen ; Hu Hongqiao ; Zhang Beichen

【期刊】55

【Journal】SCIENCE CHINA Technological Sciences

【期刊年份】2012

【卷】55

【期】

【关键词】

【Keywords】

【摘要】A number of backscatter power enhancement events with “equatorward-moving radar auroral forms” in the high-latitude ionosphere were observed by SuperDARN CUTLASS Finland radar when the IMF was northward during 09:00 –10:00 UT on 26 March 2004. These events were also associated with sunward flow enhancements at each location in the Northern Hemisphere which were shown in ionospheric onvections measured by the SuperDARN radars. These are typical features of high-latitude(lobe) magnetic reconnections. The durations of the velocity enhancements imply that the evolution time of the lobe reconnections is about 8–16 min from their origin at the reconnection site to their addition to the agnetotail lobe again. In additional,the Double Star TC-1 spacecraft was moving from magnetosheath into magnetosphere, and crossing the magnetopause near the subsolar region during this interval, and observed typical low-latitude magnetic reconnection signatures. This infers that the dayside high- and low-latitude reconnections may occur simultaneously.

【Abstract】A number of backscatter power enhancement events with “equatorward-moving radar auroral forms” in the high-latitude ionosphere were observed by SuperDARN CUTLASS Finland radar when the IMF was northward during 09:00 –10:00 UT on 26 March 2004. These events were also associated with sunward flow enhancements at each location in the Northern Hemisphere which were shown in ionospheric onvections measured by the SuperDARN radars. These are typical features of high-latitude(lobe) magnetic reconnections. The durations of the velocity enhancements imply that the evolution time of the lobe reconnections is about 8–16 min from their origin at the reconnection site to their addition to the agnetotail lobe again. In additional,the Double Star TC-1 spacecraft was moving from magnetosheath into magnetosphere, and crossing the magnetopause near the subsolar region during this interval, and observed typical low-latitude magnetic reconnection signatures. This infers that the dayside high- and low-latitude reconnections may occur simultaneously.

【基金/项目】 中国极地研究中心青年科技创新基金(JDQ201001) ; 海洋公益性行业科研专项经费项目(201005017) ; 极区电离层对日侧磁重联的响应研究 ; 日侧冕状极光的分类及其产生机制研究 ; 极区能量沉积过程及其对120E子午面电离层影响的研究 ; 中英合作极区电离层不均匀体特性研究 ; 极区海洋大气与空间环境业务化监测及其在气候变化预测中的应用(地球极区太阳风能量注入过程与模式)

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