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首页 > 中国极地考察知识库 > 成果信息库 > 已审查 行星际磁场对日侧极光激发的调制:基于新奥尔松日侧极光观测的统计研究

行星际磁场对日侧极光激发的调制:基于新奥尔松日侧极光观测的统计研究

【标题】行星际磁场对日侧极光激发的调制:基于新奥尔松日侧极光观测的统计研究

【Title】Dayside auroral emissions controlled by IMF: A survey for dayside auroral excitation at 557.7 and 630.0 nm in Ny-Ålesund, Svalbard

【DOI】10.1029/2011JA017188

【作者】 胡泽骏; 杨惠根; 韩德胜; 黄德宏; 张北辰; 胡红桥; 刘瑞源

【Author】 Hu Zejun ; Yang Huigen ; Han Desheng ; Huang Dehong ; Zhang Beichen ; Hu Hongqiao ; Liu Ruiyuan

【期刊】Journal of Geophysical Research: Space Physics

【Journal】Journal of Geophysical Research: Space Physics

【期刊年份】2012

【卷】117

【期】A2

【关键词】 auroral emission; dayside aurora; dayside reconnection; field-aligned currents; particle precipitation

【Keywords】 auroral emission; dayside aurora; dayside reconnection; field-aligned currents; particle precipitation

【摘要】

【Abstract】A survey of dayside 557.7 and 630.0 nm auroral emission, acquired from the all-sky imagers at the Yellow River Station in Ny-Ålesund, Svalbard, shows that the dayside auroral oval could be divided into five auroral active regions: the dawnside (Da, 06:00–07:30 MLT) and duskside (Du, 15:30–17:00 MLT) green aurora sectors, the prenoon (W, 07:30–10:00 MLT) and postnoon (H, 13:00–15:30 MLT) peaks for 557.7 and 630.0 nm auroral emissions, and the midday gap (M, 10:00–13:00 MLT) for green aurora. The 630.0 nm intensities in W, M, and H nearly increase linearly with the Kan-Lee electric field. The 630.0 nm auroral emissions in W and H show a double-peak feature associated with the change of interplanetary magnetic field (IMF) clock angle: one peak at 90° and the other at 270°. The 630.0 nm emission in M, however, is dominantly excited during the clock angle of 90°–270°. It is considered that the 630.0 nm emissions in W/H and M are related to the prenoon/postnoon antiparallel reconnection at the high-latitude magnetopause and the subsolar component reconnection, respectively. Moreover, the 630.0 nm intensity in the dayside oval shows the monotonic increase with the absolute value of the north-south oriented electric field (Ez), but the increasing rate of the intensity in the postnoon (prenoon) oval is larger than that in the prenoon (postnoon) oval when IMF By is negative (positive). Only the 557.7 nm intensity in region M and H/Du increases gradually with the absolute value of negative Ez. These features should be associated with the change of interhemispheric currents produced by Ez.

【基金/项目】 日侧冕状极光的分类及其产生机制研究 ; 日侧极光粒子沉降的能谱特征研究 ; 日侧重联极光的多波段观测和产生机制研究 ; 小尺度极光结构的多尺度并行观测与研究 ; 极区能量沉积过程及其对120E子午面电离层影响的研究 ; 基于全天空图像的日侧极光分类方法研究 ; 空间物理 ; 行星际磁场北向偏转触发亚暴的机制研究 ; 极区电离层对日侧磁重联的响应研究 ; 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(极区大气与空间环境业务化观测体系建设) ; 2012年度极地优秀论文二等奖

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