کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1777682 | 1523668 | 2012 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Does the polar cap disappear under an extended strong northward IMF?
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 auroral 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 (8Â h) and strong (â¼5-30Â nT) northward IMF Bz, The observations suggested that the polar cap disappeared under a closed magnetosphere.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 71, Issues 17â18, December 2009, Pages 2006-2012
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 71, Issues 17â18, December 2009, Pages 2006-2012
نویسندگان
Yongliang Zhang, Larry J. Paxton, Patrick T. Newell, Ching-I. Meng,