Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11206232b&link_type=abstract
Journal of Geophysical Research, Volume 112, Issue A6, CiteID A06232
Physics
21
Magnetospheric Physics: Substorms, Magnetospheric Physics: Plasma Convection (2463), Ionosphere: Ionospheric Dynamics, Ionosphere: Plasma Convection (2760)
Scientific paper
Case studies of flow patterns during substorms have revealed characteristic patterns in the period leading to expansion onset. Velocities in the premidnight region have been observed to become strongly sheared, and the premidnight convection reversal has been observed to extend across the midnight meridian. At expansion onset, the shear decreases and flow at midnight becomes meridional, out of the polar cap. The study presented here superposes flow patterns from 10 substorm intervals to determine the average flow patterns. The study confirms the findings of the case studies and extends them to additional local time sectors. In addition, changes to the flow pattern after expansion onset are examined.
Bristow William A.
Jensen Poul
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