Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm22a..01l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM22A-01
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
How does the magnetospheric uptake of ionospheric plasma change during storms, while the underlying ionosphere is modified by enhanced convection, precipitation and outflow? How does the outflow influence the dynamics and coupling of the magnetosphere and ionosphere, including plasma and geomagnetic field conditions of the lobes, plasmasheet and inner magnetosphere, and the evolution of the ionospheric conductance, temperature, and density? This paper addresses these questions by synthesizing results from selected presentations of the session. Observations of the F-region plasma and particle measurements in the low-altitude, high-latitude magnetosphere, lobes and plasmasheet are combined with results from ion outflow models, global kinetic models, ring-current models, and global geospace simulations. The synthesis shows that stormtime ionospheric outflows are superfluent in the cusp region with an upper flux limit of 1014 ions/m2-s. O+ beams appear in the lobes before interplanetary shock impact, and they exhibit dawn-dusk and hemispherical asymmetries, also manifested in the plasmasheet. The outflows enhance the stormtime ring current, relative to a system state with no ionospheric outflow. The distribution and intensity of the ring-current pressure depends also on the convection and the self-consistently induced magnetic field. In global simulations, the outflows modify dayside and nightside reconnection, precipitating electron power, the ionospheric conductance, the transpolar potential, and the electrodynamics of the magnetosphere-ionosphere interaction.
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