High Latitude M-I Coupling as Seen by Multiple Spacecraft, Ground-Based Instruments, and Global MHD Models

Physics

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2706 Cusp, 2724 Magnetopause And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions (2431), 2760 Plasma Convection (2463), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

On 21 January 2001, the Cluster and FAST spacecraft simultaneously observed a flow channel poleward of the cusp near Sondrestrom, Greenland, coupled to a series of Alfvénic flow bursts. These observations have been interpreted as being due to momentum transfer continuing on field lines that have been reconnected ~ 10 minutes previously, and they are associated with interplanetary B_z < 0 and |B_y| ≥ |B_z| [C. J. Farrugia et al., Ann. Geophys. 22, 2891, 2004]. Here we compare these observations to the results of a global MHD simulation of this event, and we discuss the implications of this comparison.

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