Ring Current Development and Decay During a Geomagnetic Storm

Physics

Scientific paper

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2760 Plasma Convection, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

The time evolution of H+ flux equatorial 90° pitch angle distributions, as observed during a geomagnetic storm occurred on June 4 - 7 1991, is discussed. Proton spectra hourly data from CRRES MICS experiment, obtained along the spacecraft orbit in the midnight-dusk quadrant between L ~ 4 and ~ 7, are analyzed. The potentiality of a ring current empirical model [Milillo et al., JGR, in press, 2001] is tested by attempting to reconstruct the trend of the ion distributions on a global scale during the whole storm development. The global storm major effects, like L-shell compression, partial ring current generation, and cross-tail potential drop increase are reconstructed by modifying some of the model parameters in order to best-fit the experimental data at each space and time location. During the recovery phase, when the cross-tail potential decreases, the energetic proton fast decay by diffusion across the dayside magnetopause is discussed with respect to charge exchange decay.

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