Self-consistent Coupling Between Plasma and Fields in the Inner Magnetosphere

Details Self-consistent Coupling Between Plasma and Fields in the Inner Magnetosphere Self-consistent Coupling Between Plasma and Fields in the Inner Magnetosphere

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm23d..02z&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #SM23D-02

Other

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Observations show the magnetic field in the inner magnetosphere to be significantly distorted (depressed) during geomagnetic storms. While caused by the large amount of plasma injected in the inner magnetosphere, these distortions in turn strongly influence the evolution of particle populations in the near-Earth space. Therefore, in order to understand and model accurately the inner magnetosphere dynamics one needs to account self- consistently for the complex interaction between plasma and fields. To this end, we have developed a self- consistent inner magnetosphere code, obtained by iteratively coupling a kinetic ring current model with a 3-D plasma equilibrium code. In our approach, the magnetic field is computed in force balance with the kinetic model anisotropic pressures, and then fed back into the kinetic code. Here we report results obtained with our technique, improved to a full coupling of the two models (every 5 min.), and using magnetic boundary conditions from realistic empirical models such as T04S. Another new feature of our approach is the inclusion of the electric field induced by the time change of the self-consistent magnetic field, in a form greatly facilitated by the Euler potential representation of the latter. Using our improved self-consistent model, we simulate actual geomagnetic storms and we discuss the differences between the self-consistent results and those from kinetic model runs with a dipole field. We also assess during various storm phases the strength and location of magnetic field depressions, as well as of the induced electric field. Finally, we discuss how the distorted magnetic field differentially affects the energization of ring current particles at various pitch angles.

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