Self-consistent Modeling of Magnetic Fields and Plasmas in the Inner Magnetosphere During Geomagnetic Storms

Details Self-consistent Modeling of Magnetic Fields and Plasmas in the Inner Magnetosphere During Geomagnetic Storms Self-consistent Modeling of Magnetic Fields and Plasmas in the Inner Magnetosphere During Geomagnetic Storms

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa21a0291j&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SA21A-0291

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Computation

2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954), 2799 General Or Miscellaneous

Scientific paper

Observations as well as computational simulations show that during a magnetic storm the magnetic field in the inner magnetosphere on the night side can be very stretched compared to a dipole. This is why a magnetically self-consistent treatment of plasma transport is crucial during such events. In this work we extend our previous ``1-way'' coupling between a kinetic ring current model and a magnetospheric equilibrium model (in which force-balanced fields are computed using the pressures from the kinetic model) to a fully magnetically self-consistent approach in which the force-balanced fields are fed back into the kinetic model to guide its continued evolution. The self-consistent approach is then applied to the simulation of the April 22, 2001 storm, one of the GEM Storm Challenge events. The results use boundary and initial conditions for the kinetic model from several spacecraft, as well as magnetic flux boundary conditions for the equilibrium model from the empirical model of the geomagnetic field T89. The results obtained with this self-consistent approach are fundamentally different from runs of the kinetic model with a dipolar background. The most significant features of the self-consistent results are lower plasma transport and plasma pressure in the inner magnetosphere (about half of that obtained with the dipole) and local, narrow pressure peaks as well as significantly enhanced plasma β in localized regions on the night side.

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