Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11300a08e&link_type=abstract
Journal of Geophysical Research, Volume 113, Issue A6, CiteID A00A08
Physics
6
Ionosphere: Current Systems (2721), Ionosphere: Plasma Convection (2760), Ionosphere: Ionospheric Storms (7949), Ionosphere: Ionospheric Dynamics, Ionosphere: Auroral Ionosphere (2704)
Scientific paper
The high-latitude response of sunward E × B flow and Birkeland field-aligned currents (FAC) is analyzed for the 15 May 2005 magnetic cloud that generated a great magnetic storm (SYM-H = -305 nT at 0820 UT). The interplanetary magnetic field (IMF) clock angle, $\theta$ = arctan(B y /B z ), gradually rotated from 65° to -80° during the 10-h long northward IMF period and the recovery of this storm. DMSP observations confirm a dawnward migration of a Northern Hemisphere sunward E × B flow channel (FC) between a downward and upward FAC pair. This FAC system developed during southward IMF ($\theta$ = 109°) at the poleward edge of the duskside auroral oval as part of a four-sheet FAC system 23 min before the IMF became northward. TIMED/GUVI observations show that the dawnward migration of the upward FAC coincides with a drifting transpolar auroral arc (TPA). IMAGE/WIC did not observe a TPA in the southern (winter) hemisphere. DMSP and Iridium observations are in good agreement with MHD simulation predictions of a northward IMF reorientation of high-latitude FACs. The northern FC migration was likely due to summer hemisphere conductances, a strong average IMF B x = -35 nT and the sunward dipole tilt angle that favor a northern high-latitude reconnection mechanism for a well-organized sunward FC and FAC system migration. The storm recovery rate appeared to be related with the region 2 FAC. A fast 11.4 nT/h rate was observed for a weak or nonexistent region 2 system during the high-latitude FAC redistribution. The SYM-H recovery slowed significantly to 0.9 nT/h following the 1800 UT region 2 system recovery.
Anderson Benjamin J.
Eriksson Samantha
Hairston Marc R.
Korth Haje
Rich Frederic J.
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