Ring Current Modeling Using AMIE Potentials

Details Ring Current Modeling Using AMIE Potentials Ring Current Modeling Using AMIE Potentials

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm22a0572j&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM22A-0572

Physics

2753 Numerical Modeling, 2760 Plasma Convection, 2772 Plasma Waves And Instabilities, 2778 Ring Current, 2788 Storms And Substorms

Scientific paper

We simulate the dynamical evolution of the ring current during several geomagnetic storms and compare the results inferred from Volland-Stern type and AMIE convection electric field models. A penetration electric field is added to the AMIE model [Boonsiriseth et al., 2001] to improve the agreement with measurements from the electric field instrument on Polar spacecraft. The ionospheric electric potentials are mapped to the equatorial plane using the Tsyganenko 1996 magnetic field model and the resulting equatorial potential models are coupled with our ring current model. While both Volland-Stern and AMIE models predict the largest electric potentials during the main phase of the storm, detailed comparison indicates that AMIE model predicts stronger and localized electric field penetrating to lower L shells near dusk. Ring current energy density calculations indicate a very asymmetric distribution during the main and early recovery phases. Ring current injection is larger, penetrating to lower L shells, and the Dst index better reproduced in AMIE than in Volland-Stern model. EMIC waves are predominantly excited near Dst minimum and have larger wave gain and cause stronger ion precipitation when AMIE model is used. The ion precipitation patterns predicted by our model exhibit features consistent with stormtime POLAR/IPS observations. However, in the dusk to midnight sector there seems to be a need to include the effect of current sheet scattering at L>5 during highly active conditions. Boonsiriseth et al., J. Geophys. Res., 106, 12903, 2001.

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