Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm13a1797z&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM13A-1797
Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2753] Magnetospheric Physics / Numerical Modeling, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
We present numerical simulation results of the storm-time near-Earth magnetosphere obtained with our newly improved self-consistent model, RAM-SCB. The model represents a 2-way coupling of the kinetic ring current-atmosphere interactions model (RAM) with an Euler potential-based 3D plasma equilibrium code. In our approach, the magnetic field is computed in force balance with the anisotropic pressures in RAM (anisotropy being critically important for the excitation of EMIC waves), and then returned to RAM to guide the particle dynamics. RAM-SCB thus properly treats both the kinetic drift physics crucial in the inner magnetosphere (where gradient/curvature drifts are important) and the self-consistent interaction between plasma and magnetic field (required due to the strong depressions in the field during geomagnetic storms, depressions that affect the plasma evolution). Recent improvements in RAM-SCB are the expansion of the model boundary from geosynchronous location outward and the inclusion of the induced electric fields. The RAM-SCB boundary has been expanded to 9 RE from Earth, with plasma pressure and magnetic field boundary conditions prescribed there from observations or other models (empirical or first principles). The full inclusion of the induced electric fields arising from the time changing magnetic field has been greatly facilitated by our Euler potential magnetic field representation. This presentation will analyze, using storm-time simulations of the near-Earth magnetosphere with the improved model, the effects on ring current development of the following factors: 1). plasma sheet conditions (density, temperature, local time variation, shape of distribution function), 2). self-consistent feedback between plasma and fields, and 3). induced vs. convective electric fields. We will also compare model results with observations (including global indices such as Dst, but also plasma and field observations from available spacecraft, such as POLAR, CLUSTER, and GOES).
Jordanova Vania K.
Welling Dan T.
Zaharia Sorin G.
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