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Observations of tail dynamics using ground and space based instruments during a period of multiple substorm events

By Colin Forsyth, M. Lester, Steve E. Milan, Adrian Grocott, H.U. Frey, E. Lucek, H. Rème and J.F. Watermann


This paper was presented at the Eighth International Conference on Substorms (ICS-8), held at the University of Calgary, Alberta, Canada, 27-31 March, 2006, and published in Proceedings of the Eighth International Conference on Substorms, edited by M. Syrjäsuo and E.F. Donovan, pp. 65-70. It is available from only entryWe present initial observations from an ongoing investigation into the dynamics of the magnetotail during a\ud period of multiple substorms. The investigation coordinates data from ground and space-based instruments including the\ud Cluster and IMAGE spacecraft, SuperDARN and ground magnetometers during the period 00:00UT to 05:00UT on 25th\ud August, 2003. The first substorm expansion phase, which is preceded by two pseudo-breakups at 00:38UT and 00:57UT,\ud takes place between 01:11UT and 01:50UT during which time IMAGE WIC(FUV) data for the Southern auroral oval\ud shows enhanced auroral activity almost solely in the post-midnight sector and the occurrence of auroral streamers within\ud the auroral bulge. SuperDARN map potential analysis shows a flow diversion with a northern hemisphere footprint that\ud is conjugate to a southern hemisphere auroral streamer. During this time, Cluster CIS and FGM instruments detect the\ud passage of under-populated flux tubes, or plasma bubbles, and a field rotation event, discussed as a flux rope. These\ud observations agree with current predictions on the relationship between streamers and under-populated flux tubes in the tail\ud from the Chen and Wolf model

Publisher: University of Calgary
Year: 2006
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