Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0572a&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0572
Physics
2744 Magnetotail, 2764 Plasma Sheet, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
We have used a global magnetohydrodynamic simulation coupled with in situ observations in the magnetotail and auroral images to investigate magnetosphere-ionosphere coupling during a magnetospheric substorm on December 22, 1996. The first intensification of this large multiple onset substorm occurred at 1251 UT with a second intensification at 1316 UT. The substorm sequence started when an interplanetary magnetic field with southward and dawnward components reached the dayside magnetosphere. About an hour later the reconnection rate increased at an existing neutral line located near midnight at about 25 RE from Earth. A narrow channel of high-speed earthward flow from the neutral line caused a series of vortices to form near the Earth. The first vortex formed on the dawnside; its tailward flow created a flux rope that was pinched-off into a plasmoid by internal reconnection and that was observed on Geotail. Shortly afterward, the midnight reconnection flow formed a second vortex on the duskside. This vortex was associated with the onset of auroral emissions observed on Polar, and its tailward flow created a thin post-break-up current sheet. During the 1316 UT intensification flow vortices again formed in the near-Earth tail at onset. On the duskside, the vortex's tailward flow blew open the plasma sheet and allowed the tail neutral line to develop near 10 Earth radii. In this talk we will investigate the relationship between the convection in the magnetotail and phenomena in the polar ionosphere. We will compare the energy flux deposited in the ionosphere from the simulation with that inferred from measurements by the Polar spacecraft. We will also examine the relationship between the flow vortices and ionospheric convection, and evaluate the suggestion that ionospheric line tying may have caused the flow reversal that formed the vortices.
Ashour-Abdalla Maha
Coroniti Ferdinan V.
El-Alaoui Mostafa
Frank Louis A.
Paterson William R.
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