Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/808058

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Title
Recurrent substorm activity during the passage of a corotating interaction region
Author/Creator
Morley, S. K.;  Rouillard, A. P.;  Freeman, M. P.
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Mathematical and Physical Sciences
Description
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 substorms to be common under strong driving, but with different periods of ~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.
Relation
Journal of Atmospheric and Solar-Terrestrial Physics Vol. 71, Issue 10-11, p. 1073-1081
Publisher Link
http://dx.doi.org/10.1016/j.jastp.2008.11.009
Date
2009
Publisher
Elsevier
Keyword(s)
magnetospheric substorms;  corotating interaction regions;  high-speed solar wind streams;  space weather
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/808058
Identifier
ISSN:1364-6826
Reviewed
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Subject
"Journal of Atmospheric and Solar-Terrestrial Physics"
 
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