Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13c1619m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM13C-1619
Physics
[2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2753] Magnetospheric Physics / Numerical Modeling
Scientific paper
The presence of ionospheric oxygen ions at the flanks of the magnetopause has been suggested to create more favorable conditions for the development of Kelvin-Helmholtz (KH) waves than in the absence of the heavy ions [Bourham et al, 2005]. These observations showed that during a period driven by northward Interplanetary Magnetic Field (IMF) and high solar wind dynamic pressure, the instability threshold was lowered relative to the local velocity shear, provided the oxygen mass was included in the calculation. Global magnetohydrodynamic (MHD) models are a natural tool to investigate the observed phenomenon in more detail as they allow one to artificially modify the conditions at the magnetopause boundary, e.g. the oxygen density, solar wind and IMF conditions, etc., and consider the non-linear feedback that may exist in the system. For instance, the presence of oxygen pressure modifies the magnetopause flaring angle, which, in turn, will modify the velocity shear. Here we present results of idealized MHD simulations using the mulfi-fluid version of the Lyon-Fedder-Mobarry (LFM) model and systematically study the effects of oxygen on the development of the boundary waves under different outflow and solar wind plasma and IMF conditions representative of storm times.
Lyon John
Merkin V. G.
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