High latitude pulsating aurorae revisited
High latitude pulsating aurorae revisited
复制标题
重温高纬度脉动极光
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
T. Rosenberg
中科院分区：
文献类型：
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作者：
Q. Wu;T. Rosenberg
利用南极南极站（-74.2 ° MLAT）获得的N2+ 427.8 nm发射数据，研究了不同地磁扰动水平下的昼侧极光脉动（10-40 s周期）。在地磁平静条件下（0 ≤ Kp < 1），产率分布在磁正午呈单峰型。随着Kp的增加，分布向更早的时间移动，对于1 ≤，Kp < 4，峰值出现在1000-1030 MLT。在这些较高的Kp水平下，在下午1400和1600 MLT之间的下午部分出现了第二个出现峰值，随着Kp的增加而出现得更早。这些结果进行了比较，分别获得的午前脉动观测在新奥勒松和午后脉动观测在戴维斯，北方和南半球的网站在大致相同的磁纬度的南极。南极和新奥勒松在同一时间观察到早晨的峰值，并且类似地缺乏Kp依赖性;南极和戴维斯观察到下午的峰值，具有类似的Kp依赖性，尽管戴维斯的峰值出现得更早。与早期研究的结果相反，南极观测显示早晨扇区的脉动幅度较大，总体发生率明显较高。
Dayside auroral pulsations (10–40 s periods) have been studied for different levels of geomagnetic disturbance with N2+ 427.8 nm emission data obtained at South Pole station, Antarctica (−74.2° MLAT). The occurrence distribution exhibits a single peak at magnetic noon under geomagnetically quiet conditions (0 ≤ Kp < 1). With increased Kp, the distribution shifts to earlier times, the peak occurring at 1000–1030 MLT for 1 ≤, Kp < 4. At these higher Kp levels a secondary occurrence peak is evident in the afternoon sector between 1400 and 1600 MLT, occurring earlier as Kp increases. These results are compared with those obtained separately for pre-noon pulsations observed at Ny Alesund and post-noon pulsations observed at Davis, northern and southern hemisphere sites at approximately the same magnetic latitude as South Pole. South Pole and Ny Alesund observe morning peaks at the same time and with a similar lack of Kp dependence; South Pole and Davis observe afternoon peaks with similar Kp dependence, though the peak occurs earlier at Davis. In contrast to the results from the earlier studies, the South Pole observations show larger pulsation amplitudes in the morning sector and significantly higher occurrence rates overall.