Development of An Electrodynamically Coupled Model between RCM and CTIPe

Details Development of An Electrodynamically Coupled Model between RCM and CTIPe Development of An Electrodynamically Coupled Model between RCM and CTIPe

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa51a0245m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA51A-0245

Physics

2409 Current Systems (2721), 2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2447 Modeling And Forecasting

Scientific paper

We have developed a self-consistent first-principles model of the inner magnetosphere and thermosphere- ionosphere-plasmasphere, in order to understand the response of the electrodynamic interactions within the coupled system and the role of the electrodynamics in restructuring the ionosphere, plasmasphere and thermosphere, in particular, during geomagnetically active conditions. Modeling of the storm-time ionospheric electrodynamics requires a description of the two disturbance mechanisms: prompt penetration and disturbance dynamo. We have coupled the Rice Convection Model (RCM), used to calculate the region 2 field aligned currents from the inner magnetosphere which control the shielding process of the high latitude convection electric field, and the Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) model, used to calculate the time-dependent conductivities and neutral winds that are the key to produce the disturbance dynamo as well as the quiet-time ionospheric wind dynamo. Self-consistency in the electrodynamic coupling between RCM and CTIPe is accomplished by using a common global electrodynamic solver. As compared to the historical picture of prompt penetration, our previous model results from the non self- consistent coupling 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 the arrival of the disturbance dynamo effect in the low latitude ionosphere can possibly be faster than 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 this paper, the electrodynamic interactions will be discussed using the fully self-consistently coupled model.

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