Comparison of LFM Simulated Poynting Flux With SuperDARN-Iridium Observations

Details Comparison of LFM Simulated Poynting Flux With SuperDARN-Iridium Observations Comparison of LFM Simulated Poynting Flux With SuperDARN-Iridium Observations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm21b0261m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM21B-0261

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2431 Ionosphere/Magnetosphere Interactions (2736)

Scientific paper

The solar wind interacting with the Earth's magnetosphere creates an electromagnetic connection between the ionosphere and magnetosphere through electric fields and field-aligned currents. By studying Poynting flux, we are able to better understand the energy flow in the Sun-Earth interaction. We have compared the ionospheric electric potential patterns, field-aligned current, and, for the first time, Poynting flux derived from the LFM global simulation model with observational results derived from SuperDARN and the Iridium\texttrademark satellites. We have also examined another effect on the Poynting flux that is not normally included in global MHD simulations: self-consistent mapping of the electric field from the ionosphere to the inner simulation boundary including a field-aligned potential drop -- the so-called "Knight potential." (The effect of the Knight potential is typically only included in the proxy for the precipitating electron number and energy fluxes that enter the empirically specified ionospheric conductivity). Although the influence of the field- aligned potential drop on integrated parameters such as the transpolar potential is relatively weak, we demonstrate here that it significantly influences the global patterns of potential, field-aligned current and Poynting flux. Inclusion of the energy dissipation implied by the self-consistent electric field mapping is an important step because it more consistently represents the energy budget of the system.

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