Motion of the dipolarization front during a flow burst event observed by Cluster
Balogh, A.; Zhang, T. L.; Dandouras, I.; Glassmeier, K. -H.; Klecker, B.; Nakamura, R.; Baumjohann, W.; Rème, H.; Bosqued, J. M.; Kistler, L.; Mouikis, C.; Runov, A.; Sauvaud, J. A.; Bogdanova, Y.; Eichelberger, H.
Abstract
In this paper we study a flow burst event which took place during enhanced geomagnetic activity on July 22, 2001, when Cluster was located in the postmidnight magnetotail. The flow burst was associated with a clear dipolarization ahead of the high-speed part of the predominantly Earthward directed flow. Based on the analysis of the four spacecraft data, we found that a ~2000 km thick dipolarization front moves Earthward and dawnward with a speed of ~77 km/s. The plasma before this front is deflected, consistent with the plasma ahead of a localized plasma bubble centered at midnight side being pushed aside by the moving obstacle. The main body of the high-speed flow is directed mainly parallel to the dipolarization front. These observations indicate that the evolution of the dipolarization front across the tail is directly coupled with the fast flow.