Physics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm31a0401w&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM31A-0401
Physics
2744 Magnetotail, 2753 Numerical Modeling, 2760 Plasma Convection (2463), 2790 Substorms
Scientific paper
We have used a global magnetohydrodynamic simulation to investigate magnetospheric convection during a major substorm that occurred during a prolonged interval with southward interplanetary magnetic field on February 13 and 14, 2001. Early in the substorm a near-Earth neutral line located between 20RE and 40RE drove flows earthward and then around the near-Earth obstacle to return magnetic flux to the dayside. The earthward flow lead to increased ionospheric conductance and developed a modest earthward pressure gradient in the inner plasma sheet. Ionospheric line tying and the pressure gradient were sufficient to stop the earthward convection and then reverse it. When the tailward moving flux tube reached the near-Earth neutral line additional reconnection occurred between the tailward moving flux tube and IMF field lines created by lobe reconnection thereby returning flux to the night side tail lobes. Late in the event the new lobe field lines reconnected at the dusk side magnetopause creating additional rapid tailward motion. The tailward flow lead to a reduction in both the ionospheric conductance and near-Earth tail pressure gradient and earthward flow was again established. This sequence repeated at least three times during the interval simulated.
Ashour-Abdalla Maha
El Alaoui Mostafa
Walker Ray J.
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