Journal
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
Volume 71, Issue 17-18, Pages 2006-2012Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jastp.2009.09.005
Keywords
Aurora; Double reconnection; Interplanetary magnetic field; Closed field fine
Funding
- NASA CDAWeb
- TIMED GUVI
- DMSP SSUSI
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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.
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