Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jass...25..375k&link_type=abstract
Journal of Astronomy and Space Sciences. Vol. 25, no. 4, 375-382
Astronomy and Astrophysics
Astronomy
Substorm, Solar Wind Pressure Impulse, Magnetotail
Scientific paper
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_{bot x}) were observed. Auroral brightenings localized in the pre-midnight sector (˜2200-2400 MLT) occurred during the interval of the V_{bot x} enhancements. The V_{bot 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_{bot x} caused localized auroral brightenings.
Hwang Junga
Kim Khan-Hyuk
Kwak Young-Sil
Lee Jae-Jin
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