Simulated Response of the Magnetosphere-Ionosphere System to Different Forms of Empirically Regulated Ionospheric Outflows

Details Simulated Response of the Magnetosphere-Ionosphere System to Different Forms of Empirically Regulated Ionospheric Outflows Simulated Response of the Magnetosphere-Ionosphere System to Different Forms of Empirically Regulated Ionospheric Outflows

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11d..08l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM11D-08

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2431 Ionosphere/Magnetosphere Interactions (2736), 2721 Field-Aligned Currents And Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions (2431), 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling

Scientific paper

Empirically derived power-law relations between the locally measured Poynting flux (S) flowing toward the ionosphere and the number flux of ions (F) flowing away from the ionosphere exhibit significant differences that depend on the choice of satellite data samples (Strangeway et al., 2005; Zheng et al., 2005). Such relations attempt to capture in lumped form the causality of electromagnetic power flows into collisionless ion acceleration in the topside ionosphere and low-altitude magnetosphere and the resulting ion outflows -- effects that are otherwise difficult to treat in first-principles fluid models for the field-aligned mass transport. We have implemented a power-law relation of the form F = A*S**b, where A and b are adjustable parameters ultimately constrained by observation, as a low-altitude boundary condition on the LFM global simulation model. This boundary condition allows ions of ionospheric origin to enter the magnetospheric simulation domain and to mix with plasma of solar wind origin in populating the magnetosphere. According to the empirical relation, more ionospheric ions are causally injected into the simulation domain as the Poynting flux through the low-altitude boundary increases. In this paper, we report results from simulations using different values of the parameters A and b to determine the sensitivity of the magnetospheric response to the form of the empirical relation. Simulation diagnostics for the transpolar potential, field-aligned current, ionospheric conductivity, precipitating electron energy flux, and Joule dissipation rate will be presented.

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