Modeling the "gap" region between the ionosphere and magnetosphere

Details Modeling the "gap" region between the ionosphere and magnetosphere Modeling the "gap" region between the ionosphere and magnetosphere

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa41b1419g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA41B-1419

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2431 Ionosphere/Magnetosphere Interactions (2736), 2475 Polar Cap Ionosphere, 2481 Topside Ionosphere, 2736 Magnetosphere/Ionosphere Interactions (2431), 7959 Models

Scientific paper

The gap region refers to the 2-3 Re space between the outer boundary of most ionosphere models, and the inner boundary of most magnetosphere models. Ambipolar electric fields, Field Aligned Currents (FACs), Joule heating, centrifugal acceleration, wave-particle interactions, and other physical phenomenon in the gap region accelerate plasma and can lead to mass flow from the ionosphere to the magnetosphere. Most Magnetosphere-Ionosphere Coupling (MIC) models ignore these processes instead relying on pressure gradient terms to draw plasma off the inner boundary of the magnetosphere. We present preliminary results of new efforts to model the "gap" region in the Space Weather Modeling Framework (SWMF). In particular, we use the Polar Wind Outflow Model (PWOM), a field-aligned multi-fluid polar wind code, and describe efforts to couple it to the Upper Atmosphere (UA), Ionosphere Electrodynamics (IE), and Global Magnetosphere (GM) components of the SWMF. We present our methodology for the MIC, as well as several controlled numerical experiments demonstrating the importance of different physical processes in the gap region.

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