Recurrent substorm activity during the passage of a corotating interaction region

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.

Details

Publication status:
Published
Author(s):
Authors: Morley, S.K., Rouillard, A.P., Freeman, Mervyn P. ORCIDORCID record for Mervyn P. Freeman

On this site: Mervyn Freeman
Date:
1 January, 2009
Journal/Source:
Journal of Atmospheric and Solar-Terrestrial Physics / 71
Page(s):
1073-1081
Digital Object Identifier (DOI):
https://doi.org/10.1016/j.jastp.2008.11.009