Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsa51a..02s&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SA51A-02
Physics
2407 Auroral Ionosphere (2704), 2411 Electric Fields (2712), 2427 Ionosphere/Atmosphere Interactions (0335), 2447 Modeling And Forecasting
Scientific paper
It is well established that the magnetosphere drives upper atmospheric dynamics at high latitudes. In the usual description of energy flow, the ionosphere is treated as a mediating element, responding to fluxes of energy (ionizing and non-ionizing) from the magnetosphere, and dissipating this energy in the neutral gas. The mediation process, however, is complicated by feedback: magnetospheric forcing in the form of particle precipitation structures the ionospheric plasma, altering the properties of the electrical load seen by the magnetosphere, and inducing sheared flows in the plasma and neutral gases; forcing in the form of heat flux increases the plasma and neutral scale heights, altering the altitude at which various turbulent processes occur; forcing in the form of Poynting flux heats the upper E-region, altering ion composition and reducing the rate of plasma recombination which, again, affects electrodynamic coupling with the magnetosphere. Such local processes occur simultaneously over global-scale regions and, thus, have aggregate global-scale consequences which are neither well appreciated nor well understood. Fortunately, the mediating element - the ionosphere - may be readily and comprehensively observed by optical and radio techniques from both ground and space. Coupled with appropriate modeling, it is possible to derive information about both the magnetospheric source and the thermospheric response via forward modeling or model-based inversion, respectively. This talk present a synthesis of observations and modeling related to small-scale ITM interactions, and outlines strategies for accessing this physics using hybrid model-data approaches.
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