Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh21a1501s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH21A-1501
Physics
Plasma Physics
[7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7859] Space Plasma Physics / Transport Processes, [7863] Space Plasma Physics / Turbulence
Scientific paper
We develop a two dimensional, self-consistent, compressible fluid model to study evolution of Alfvenic modes in partially ionized astrophysical and space plasmas. The partially ionized plasma consists mainly of electrons, ions and significant neutral atoms. The nonlinear interactions amongst these species take place predominantly through direct collision or charge exchange processes. Our model uniquely describe the interaction processes between two distinctly evolving fluids. In our model, the electrons and ions are described by a single fluid compressible magnetohydrodynamic (MHD) model which are coupled self-consistently to the neutral fluid via compressible hydrodynamic equations. Both plasma and neutral fluids are treated with different energy equations that adequately enable us to monitor non adiabatic and thermal energy exchange processes between these two distinct fluids. Our self-consistent model is successfully applied to study the propagation of Alfvenic modes in space and astrophysical plasma in which waves damp due to direct collisions with the neutral atoms. Consequently, energy transfer takes place between plasma and neutral fluids. We present the results of our preliminary simulations and discuss these energy transfer processes, mode coupling interactions, and spectral features. Our simulations are useful to understand wave damping and energy transfer processes in molecular clouds, heliosheath and outer heliospheric plasmas.
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