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Earthward Flow Bursts in the Magnetotail Driven by Solar Wind Pressure Impulse
김관혁,곽영실,이재진,황정아 한국우주과학회 2008 Journal of Astronomy and Space Sciences Vol.25 No.4
On August 31, 2001, ~1705-1718 UT, Cluster was located near the midnight magnetotail, GSE (x, y, z) ~ (-19, -2, 2) RE, and observed fast earthward flow bursts in the vicinity of the neutral sheet. They occurred while the tail magnetic field suddenly increased. Using simultaneous measurements in the solar wind, at geosynchronous orbit, and on the ground, it is confirmed that tail magnetic field enhancement is due to an increased solar wind pressure. In the neutral sheet region, strongly enhanced earthward flow bursts perpendicular to the local magnetic field (V_x) were observed. Auroral brightenings localized in the pre-midnight sector (~ 2200-2400 MLT) occurred during the interval of the V_x enhancements. The V_x bursts started ~ 2 minutes before the onset of auroral brightenings. Our observations suggest that the earthward flow bursts are associated with tail reconnection directly driven by a solar wind pressure impulse and that V_x caused localized auroral brightenings.