- Title
- Recurrent substorm activity during the passage of a corotating interaction region
- Creator
- Morley, S. K.; Rouillard, A. P.; Freeman, M. P.
- 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
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2009
- 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.
- Subject
- magnetospheric substorms; corotating interaction regions; high-speed solar wind streams; space weather
- Identifier
- uon:7587
- Identifier
- http://hdl.handle.net/1959.13/808058
- Identifier
- ISSN:1364-6826
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