Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa41a..06m&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA41A-06
Other
2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2441 Ionospheric Storms (7949), 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 the geomagnetic disturbances. Modeling of the storm-time ionospheric electric fields 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 controls the shielding process, and the Coupled Thermosphere Ionosphere Plasmasphere electrodynamics (CTIPe) model, driven, in part, by RCM-computed electric fields, used to calculate the time-dependent conductivities and neutral winds which are the key to produce the disturbance 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. On the other hand, the feedback of the storm-time conductivity and neutral wind on the inner magnetospheric electric field has a larger impact on the night side, indicating that the disturbance dynamo can modify the penetration electric field. In this presentation, the above issues of the electrodynamic interactions will be addressed by the fully self consistently coupled model.
Anderson Daniel
Codrescu Mihail
Fuller-Rowell Tim J.
Maruyama Naomi
Maute Astrid
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