Sorin Zaharia

TL;DR: In this article, the authors investigate the temporal and spatial evolution of the ring current during two storms selected for study by the Geospace Environment Modeling (GEM) program using our kinetic drift-loss model coupled with a time-dependent plasmasphere model.

TL;DR: In this paper, the acceleration of test particles (protons and electrons) to suprathermal energies was investigated using the electromagnetic fields of a recent MHD simulation of magnetotail reconnection, flow bursts and dipolarization, confirming and extending earlier results on acceleration mechanisms and sources.

TL;DR: In this article, a self-consistent coupling between a kinetic ring current model and a magnetospheric force-balance model was proposed to simulate the GEM Storm Challenge event.

TL;DR: In this paper, the effects of non-ipolar magnetic field configuration and feedback of a self-consistently computed magnetic field on ring current dynamics were investigated during a double-dip storm with minima SYM-H = -90 nT at ~2000 UT, 20 November, and SYMH = −127 nT = -127 nTs at ~1000 UT, 21 November 2002.

TL;DR: The 2008-2009 GEM Metrics Challenge asked modelers to submit results for four geomagnetic storm events and five different types of observations that can be modeled by statistical, climatological or physics-based models of the magnetosphere-ionosphere system.