Convection Transients in the Polar Cap During Substorms

Details Convection Transients in the Polar Cap During Substorms Convection Transients in the Polar Cap During Substorms

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0581q&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0581

Physics

2760 Plasma Convection, 2776 Polar Cap Phenomena, 2788 Storms And Substorms

Scientific paper

We report transient convection signatures during substorms, seen by the Cluster satellites at about 7 RE on field lines mapping to the central polar cap, using data from EDI and FGM on Cluster, and WIC on IMAGE. In these events, typically lasting 1-3 minutes, the Ygse component of electric field (corresponding to anti-sunward polar cap convection) drops from a quasi-steady value of a few mV/m, to zero or slightly negative values, and then returns to the quasi-steady level. At the same time the magnetic field shifts to a less "tailward" direction. We interpret these events as part of the global reconfiguration associated with substorms.

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