极地研究

极地研究 ›› 2011, Vol. 23 ›› Issue (4): 259-263.DOI: 10.3724/SP.J.1084.2011.00259

• 研究论文 • 上一篇    下一篇

亚暴等待时间的统计学分析：IMAGE卫星观测

王慧1,杨冰1,华滢1,Liu William1,2   

  1. 1. 武汉大学电信学院空间物理系
    2. Space Science and Technology Branch, Canadian Space Agency Saint Hubert, Quebec, Canada
  • 收稿日期:2011-03-04 修回日期:2011-06-17 出版日期:2011-12-30 发布日期:2011-12-30
  • 通讯作者: 王慧
  • 基金资助:

    国家自然科学基金;教育部留学归国人员基金;中央高校基本科研业务费专项资金

STATISTICAL STUDY OF SUBSTORM WAIT TIME:IMAGE OBSERVATION

Wang Hui1, Yang Bing1, Hua Ying1, Liu Weining1,2   

  1. 1. Department of Space Physics，School of Electronics and Information，Wuhan University
    2. Space Science and Technology Branch, Canadian Space Agency Saint Hubert, Quebec, Canada
  • Received:2011-03-04 Revised:2011-06-17 Online:2011-12-30 Published:2011-12-30

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摘要：

本文利用IMAGE 卫星FUV极光图像数据，对北半球极光椭圆带2760个亚暴事件进行统计分析，得到亚暴等待时间的统计分布，并利用简单的数学模型对卫星轨道的影响进行了讨论，得到以下结论：（1）亚暴等待时间在2-3小时附近有一个峰值，较低纬度（近磁尾）发生的亚暴事件，其等待时间略长于较高纬度（远磁尾）发生的亚暴事件；（2）近磁尾发生的亚暴其等待时间分布主要是高斯分布，远磁尾发生的亚暴其等待时间分布是高斯和泊松分布的叠加，表明近磁尾发生的亚暴事件比远磁尾的亚暴事件更具有周期性；（3）卫星轨道的影响主要在10小时以后，对近磁尾发生的亚暴事件的影响更大，造成8小时处伪峰值的出现。

关键词: 亚暴, 等待时间, IMAGE, 卫星轨道

Abstract:

This paper has analyzed 2760 substorm events in the northern hemisphere by using IMAGE FUV observations in order to get the probability distribution of substorm wait time (time interval between substorm onsets). The effects of the satellite orbit have been taken in account. It is found: (1) the most probable substorm wait time is between 2 and 3 hours. The wait time is longer for substorms occurring at lower latitudes (near Earth) than those occurring at higher latitudes (far tail); (2) For substorms occurring in the near Earth region, the wait time satisfies Gauss distribution, while for those in the far tail, the wait time satisfy both Gauss and Poisson distribution. This may indicate that the near Earth substorm events are more periodic than far tail events; (3) the satellite orbit affects the wait time distribution mainly after 10 hours. And it causes one psudo-peak around 8 hours, which is more apparent in the lower latitude events than in the higher latitude.

Key words: substorm, wait time, IMAGE, satellite orbit