Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51c..01c&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM51C-01
Physics
2730 Magnetosphere: Inner, 2778 Ring Current, 2788 Storms And Substorms, 7843 Numerical Simulation Studies
Scientific paper
In the past we have traced particles in simplified models of the magnetospheric convection electric field to explain injection of particles to the stormtime ring current. We have begun to trace the guiding-center motion of ions and electrons having a constant first adiabatic invariant in the more realistic AMIE electric field. The magnetic field we use is a dipole field plus a uniform southward IMF, a simple field model that allows for an analytical mapping of ionospheric AMIE potentials to anywhere within the model. We compare drift trajectories and required drift times for representative ring current particles in the AMIE electric field with those for our previous simplified electric field model for several large storms. During the 19 October 1998 storm we find that large AMIE electric fields in the evening sector leads to much faster ( ~ 20 minutes) inward transport from the plasma sheet to where the partial ring current is formed than in the simplified electric field model. This result is consistent with recent observations of the time scale for partial ring current formation. For the extremely large 15 July 2000 (Bastille Day), storm in which large stormtime penetration electric fields were observed by the DMSP satellite, we find deep penetration of ring current ions to as low as L ~ 2. We discuss the implication of the rapid and azimuthally asymmetric stormtime access under this more realistic electric field for ring current formation and decay.
Chen Margaret W.
Lu Gang
Lyons Larry R.
Schulz Michael
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