Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm31a2092k&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM31A-2092
Physics
Plasma Physics
[2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7859] Space Plasma Physics / Transport Processes
Scientific paper
Satellites in the auroral region often detect energetic heavy ion outflows together with electromagnetic ion cyclotron wave activity (1-100Hz). Because the Poynting flux of the waves is into the ionosphere, the waves can energize the ions at lower altitude leading to ion outflow from the topside ionosphere. One difficulty with relating the ion outflows to the wave activity is the nonlocality of the heating process---much of the heating occurs between the ionosphere (where the ions originate) and the spacecraft. In order to properly model the ion outflow process, it is necessary to know the distribution of wave power as a function of altitude. To this end, we model wave propagation using the full wave equations, which allow for coupling between the right-hand circularly polarized and left-hand circularly polarized modes through mode conversion processes. The quasilinear heating rate is derived from the linear wave solutions and is used in a Monte Carlo transport model to determine the associated ion outflow distributions. Because the wave solutions depend sensitively on heavy ion concentrations, we consider the feedback of heavy ions on the background density profiles using an iterative procedure that (1) solves for the wave power based on the background plasma model and (2) updates the background plasma model based on the Monte-Carlo transport model. The iterative technique converges rapidly to a steady state, and we discuss properties of the resulting oxygen and helium outflow distributions.
Johnson Jesse
Keller Sandra
Kim Erik
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