Orientation variation of dayside auroral arc alignments obtained from all-sky observation at yellow river station, Svalbard
Orientation variation of dayside auroral arc alignments obtained from all-sky observation at yellow river station, Svalbard
复制标题
斯瓦尔巴群岛黄河站全天观测获得的日侧极光弧线的方向变化
DOI：
10.1016/j.jastp.2016.02.019
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发表时间：
2016
影响因子：
1.9
通讯作者：
Wang Qian
中科院分区：
文献类型：
--
作者：
Qiu Qi;Yang Hui-Gen;Lu Quan-Ming;Hu Ze-Jun;Han De-Sheng;Wang Qian
对斯瓦尔巴特群岛黄河站40,000多幅全天观测的图像进行了日边极光弧线方位的计算。对于每条弧线，其“方位”和“倾斜度”分别定义为弧线与黄昏-黎明方向和局部东西方向的夹角。平均电弧取向随磁局部时间(MLT)的增加而线性增加。在10.5MLT附近有一个弧形倾斜的反转点。与平均方位相比，午前极光弧线在高纬度偏向晨侧，在低纬偏向晚侧，而在午后方向则相反。我们进一步研究了行星际磁场(IMF)对弧形倾斜反转点位置的影响。我们发现，对于负值，反转位置向午盘方向移动。
The orientations of dayside auroral arc alignments were calculated for over 40,000 images from all-sky observation at Yellow River Station, Svalbard. For each arc, its “orientation” and “tilt” are defined as the angle the arc alignment makes with the dusk-dawn direction and the local east-west direction, respectively. The mean arc orientation increases linearly with the increasing magnetic local time (MLT). There is a reversal point of the arc tilt located at near 10.5 MLT. Compared with the mean orientation, auroral arc alignment tilts to morning side in the higher latitude and tilts to evening side in the lower latitude in the prenoon sector, whereas it is the opposite in the postnoon sector. We further studied the effects of the interplanetary magnetic field (IMF) on the location of the arc tilt reversal point. We found that the reversal position shifts toward the midday for negative By.