Statistics – Computation
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm53b..02z&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM53B-02
Statistics
Computation
2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954), 7954 Magnetic Storms (2788)
Scientific paper
The complex interaction between plasma and fields in the inner magnetosphere during geomagnetic storms requires self-consistent modeling. We previously achieved magnetic self-consistency by iteratively coupling a kinetic ring current model with a three-dimensional plasma equilibrium code. In that approach, the B-field in force balance with the kinetic model anisotropic pressure was computed and then fed back into the kinetic code to guide its evolution. Here we refine that approach by: 1). improving the coupling between the two models (coupling plasma and field every 5 minutes); and 2) employing boundary conditions for the equilibrium model from the TS04 storm-based empirical model. We simulate actual geomagnetic storms and we discuss the differences between the self-consistent results and those from kinetic model runs with a dipolar field. Finally, our approach did not include so far the effects of the electric field induced by the time change of the B- field. As a first step toward its full inclusion, here we also compute the E-field from time sequences of the self- consistent magnetic field, a computation that is greatly facilitated by the Euler potential representation of the B-field. We then assess during various storm phases the strength and location of the induced electric field vs. the empirical convective field used in the kinetic model.
Jordanova Vania K.
Reeves Geoff D.
Thomsen Michelle F.
Zaharia Sorin G.
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