Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm52b..02b&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM52B-02
Physics
2736 Magnetosphere/Ionosphere Interactions, 2760 Plasma Convection, 2764 Plasma Sheet, 2788 Storms And Substorms
Scientific paper
A study of convection patterns during substorms observed by the SuperDARN radar network is presented. Specific attention is given to the growth phase and the time immediately following expansion onset. It is found that the growth phase is characterized by the enhancement of the velocity shear near midnight, and its extension to low latitudes and to local times across the midnight meridian. The velocity shear was observed to diminish at expansion onset. In addition the ionospheric flow velocity magnitude was observed to be enhanced for some period of time prior to expansion onset and to decrease at expansion onset. Possible explanations for the establishment of the midnight velocity shear during growth phase and its subsequent disappearance at expansion onset are presented. Specific focus is given to the conditions in the plasma sheet that could establish the observed convection. Also, arguments are presented regarding the decrease of ionospheric flow velocity at expansion onset.
Bristow William A.
Lummerzheim Dirk
Otto Andreas
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