Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm14b..01j&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM14B-01
Physics
2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
The evolution of the ring current distributions during magnetic storms depends strongly on the temporal and spatial variations of the inner magnetospheric electric and magnetic fields. In previous simulation studies we have used various approximations of the convection electric field, but mostly a dipolar approximation of the magnetic field of the Earth. We have now proceeded toward the implementation of a more realistic, non-dipolar magnetic field geometry in our kinetic ring current-atmosphere interactions model (RAM). In addition, we have coupled it with a 3-D equilibrium model that calculates self-consistently the magnetic field in force balance with the anisotropic ring current distributions. We use this newly improved model to simulate ring current dynamics during the moderate storm of October 25, 2002, that was chosen by the LWS TR&T team for detailed investigation. Ring current intensification due to enhanced plasma inflow from the magnetotail, convective transport, and adiabatic acceleration is considered. We study the storm-time injection of energetic particles and the mechanisms responsible for their trapping and for causing their loss. Ring current simulations using this newly developed model will be compared with simulations using either dipolar magnetic field model or the empirical magnetic field models of Tsyganenko, to assess the effect of non-dipolar magnetic field geometry and the feedback of the self-consistently computed magnetic field on ring current dynamics.
Jordanova Vania K.
Thomsen Michelle F.
Vapirev Alexander E.
Zaharia Sorin G.
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