Recurrent substorm activity during the passage of a corotating interaction region

Morley, S.K.; Rouillard, A.P.; Freeman, Mervyn P.. 2009 Recurrent substorm activity during the passage of a corotating interaction region. Journal of Atmospheric and Solar-Terrestrial Physics, 71 (10-11). 1073-1081. 10.1016/j.jastp.2008.11.009

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Abstract/Summary

Recent observations of magnetospheric dynamics driven by interaction with both high-speed solar wind streams (HSSs) and interplanetary coronal mass ejections (ICMEs) have shown periodic substonns to be common under strong driving, but with different periods of similar to 4 and 2-3 h, respectively. However, it is unclear what causes these substorms and what determines their periodicity. Observations during the passage of a corotating interaction region preceding a high-speed stream are presented here and the observed enhancements in the AE index are shown to be a quasi-periodic sequence of substorms. The occurrence times of these substorms and the variation of the AL index are shown to be consistent with a simple loading-unloading model without the need for external triggers. A possible explanation is given for the lengthening of the inter-substorm period during HSS relative to that of sawtooth events during ICMEs. (C) 2009 Elsevier Ltd. All rights reserved.

Item Type:	Article
Identification Number/DOI:	10.1016/j.jastp.2008.11.009
Programmes:	BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Natural Complexity Programme
ISSN:	1364-6826
Additional Keywords:	Magnetospheric substorms; Corotating interaction regions; High-speed solar wind streams; Space weather
NORA Subject Terms:	Physics Atmospheric Sciences Space Sciences
Date made live:	08 Nov 2010 14:11
URI:	http://nora.nerc.ac.uk/id/eprint/11156

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