期刊
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
卷 71, 期 17-18, 页码 2006-2012出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jastp.2009.09.005
关键词
Aurora; Double reconnection; Interplanetary magnetic field; Closed field fine
资金
- NASA CDAWeb
- TIMED GUVI
- DMSP SSUSI
The suggestion that the polar cap can completely disappear under certain northward IMF conditions is still controversial. We know that the size of the polar cap is strongly controlled by the interplanetary magnetic field (IMF). Under a southward IMF, the polar cap is usually large and filled with weak diffuse polar rain electrons. The polar cap shrinks under a northward IMF. Here we use the global aurora[ images and coincident particle measurements on May 15, 2005 to show that the discrete arcs (due to precipitation of both electrons and ions) expanded from the dayside oval to the nightside oval and filled the whole polar ionosphere after a long (8 h) and strong (similar to 5-30 nT) northward IMF B,, The observations suggested that the polar cap disappeared under a closed magnetosphere. (C) 2009 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据