Modeling of the storm-time ionospheric electric fields

Details Modeling of the storm-time ionospheric electric fields Modeling of the storm-time ionospheric electric fields

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa41a1396m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA41A-1396

Physics

2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2441 Ionospheric Storms (7949), 2447 Modeling And Forecasting

Scientific paper

Modeling of the storm-time ionospheric electric fields requires a description of the two disturbance mechanisms: prompt penetration and disturbance dynamo. In order to investigate the storm-time interaction between the two sources and the role of the electrodynamics in restructuring the ionosphere, plasmasphere and thermosphere, we have combined the Rice Convection Model (RCM), used to calculate inner magnetospheric electric fields, and the Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) model, driven, in part, by RCM-computed electric fields. As compared to the historical picture of prompt penetration, our model results suggest the possibility that penetration effects can have a longer lifetime when the IMF Bz is large and negative as a consequence of the ineffective shielding resulting from the magnetospheric reconfiguration. Furthermore, our simulations indicate that arrival of the disturbance dynamo effect in the low latitude ionosphere can possibly be faster than the previously believed, as the disturbance dynamo is modified by the changes in the conductivity and neutral wind initiated by the penetration effect. Comparison of the results from the combined models with observations under a variety of conditions demonstrates that our models are capable of reproducing many of the measurements in the ionosphere. In order to address the feedback of the storm-time conductivity and neutral wind on the inner magnetospheric electric field, the CTIPe conductivity and neutral wind are imposed on the RCM. With an ultimate purpose of developing a self-consistent first-principles model, we have initiated coupling between CTIPe and RCM, and some preliminary results will be presented.

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