Nakamura, R; Baumjohann, W; Klecker, B; Bogdanova, Y; Balogh, A; Reme, H; Bosqued, JM; ... Runov, A; + view all Nakamura, R; Baumjohann, W; Klecker, B; Bogdanova, Y; Balogh, A; Reme, H; Bosqued, JM; Dandouras, I; Sauvaud, JA; Glassmeier, KH; Kistler, L; Mouikis, C; Zhang, TL; Eichelberger, H; Runov, A; - view fewer (2002) Motion of the dipolarization front during a flow burst event observed by Cluster. Geophysical Research Letters , 29 (20) , Article 1942. 10.1029/2002GL015763.

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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 similar to2000 km thick dipolarization front moves Earthward and dawnward with a speed of similar to77 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.

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