Stong Sunward Propagating Flow Bursts in the Night Sector During a Prolonged Period of IMF Bz>0

C. SENIOR, J.-C. CERISIER, F. RICH, and M. LESTER
CETP, France

High-time resolution data from the two SuperDARN radars located in Iceland show very strong nightside activity during a prolonged period of IMF Bz positive and very low solar wind dynamic pressure. Flows bursts of velocities sometimes over 1.5 km/s are observed to propagate in the sunward direction at phase velocities of up to 2 km/s. They occurs over several hours of MLT in the 18-24 MLT sector with a repetition time of a few minutes. DMSP passes during the time period when these flow bursts are observed indicate an almost closed magnetosphere characteristic of a northward IMF. One of these passes occurs over the Stokkseyri field of view while one of these sporadic features is observed. It indicates that the flow bursts appear in the plasma sheet, south of the convection reversal of the evening viscous cell.

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