Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm12a..08l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM12A-08
Physics
2427 Ionosphere/Atmosphere Interactions (0335), 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions, 2788 Magnetic Storms And Substorms (7954)
Scientific paper
The 7-8 November superstorm has been simulated using the one-fluid LFM global simulation model including ionospheric outflow. The outflow is specified using the empirical relations developed by Strangeway et al. (2005) between ion outflow flux, downward Poynting flux and precipitating electron flux. Results of the simulations with and without outflow are compared to evaluate the effects of the outflow on the global system dynamics. For this storm, the outflow flux varies dynamically with variations in both solar wind dynamic pressure and IMF Bz. We find that outflows regulated in this way: 1) produce a more extended and denser plasmasheet; and 2) increase the density and pressure of the inner magnetosphere, with a resulting increase in the magnetopause standoff distance. The Poynting flux flowing into the more sunlit ionosphere is larger than that in the darker hemisphere, and, therefore, the outflow fluence is larger in that hemisphere. Peak outflow fluxes of a few 1014/m2-s are obtained with peak fluences approaching 1028 ions/s. The outflows also produce the following effects on the magnetosphere-ionosphere interaction: 1) ~30% increase in the power of precipitating electrons, with peak hemispheric power of 600 GW; 2) reduction in the field-aligned current and Joule dissipation; and 3) variable increase and decrease in the transpolar potential during different phases of the storm.
Brambles O. J.
Damiano Peter A.
Lotko William
Wiltberger Michael
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