Statistics – Computation
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13b..07j&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM13B-07
Statistics
Computation
2712 Electric Fields (2411), 2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2778 Ring Current
Scientific paper
Satellite observations indicate that the magnetic field may be significantly depressed compared to dipolar near the equatorial plane in the inner magnetosphere during storm time. We investigate the effect of non- dipolar magnetic field geometry and the feedback of a self-consistently computed magnetic field on ring current dynamics during the 31 August 2005 geomagnetic storm. This large storm with maximum Kp=7 at 18 UT and minimum Dst=-131 nT at 20 UT on 31 August was selected for detailed study by the LWS TR&T Focus Team on ionospheric-magnetospheric plasma storm time redistribution. We use our kinetic ring current-atmosphere interactions model (RAM) that has been extended for non-dipolar magnetic field geometry. The RAM is coupled with a 3-D model that calculates self-consistently the three-dimensional magnetic field in force balance with the anisotropic ring current ion distributions. We find that the ring current fluxes calculated with a self-consistent B field are smaller compared to the dipolar B field calculations. We show an initial computation of the electric fields induced by the time change of the self- consistent magnetic fields. We simulate the sunward transport, acceleration, and loss of ring current ions using our improved RAM and investigate the effects of 1) various O+/H+ composition ratios applied at the outer boundary, and 2) the induced electric fields on ring current dynamics. We discuss ring current morphology, ion composition, pitch angle anisotropy, source and loss processes during various storm phases.
Jordanova Vania K.
Zaharia Sorin
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