Bulk Acceleration of Outflowing Ionospheric Thermal Plasma in Multi-Fluid MHD

Details Bulk Acceleration of Outflowing Ionospheric Thermal Plasma in Multi-Fluid MHD Bulk Acceleration of Outflowing Ionospheric Thermal Plasma in Multi-Fluid MHD

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1636g&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1636

Physics

2700 Magnetospheric Physics (6939), 2736 Magnetosphere/Ionosphere Interactions (2431), 2753 Numerical Modeling

Scientific paper

We present an analysis of the forces that accelerate outflowing ionospheric O+ in MHD plasma. The acceleration of outflowing O+ from the high-altitude polar cap region has been examined observationally from analysis of satellite data and theoretically from tracing particle trajectories (e.g. Nilsson et al., Cully et al.). An increasing interest in the role of O+ in magnetospheric dynamics and the need to globally quantify the dynamics and effects of outflowing O+ has led to the use of MHD models to simulate the behavior of outflowing plasma. However, an understanding of the relevant forces that act to accelerate the outflow within these models is still lacking. We analyze results from the Multi-Fluid Lyon-Fedder-Mobarry (MFLFM) MHD model, including thermal O+ outflow from an empirical model derived from Akebono data. We present an assessment of the relevant field-aligned acceleration terms in the MFLFM. Our results show that for low- velocity thermal outflow, the pressure gradient, rather than the centrifugal force, is the dominant term that accelerates MHD plasma above the high-altitude polar cap.

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