Some properties of dispersive Alfven waves. 4. Hydrodynamics (finite and high pressure plasma)

1Malovichko, PP
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kinemat. fiz. nebesnyh tel (Online) 2014, 30(5):22-38
Start Page: Space Physics
Language: Russian

The behaviour of dispersive Alfven waves (DAW) for some unstudied regions like finite and high pressure astrophysical plasma is investigated in hydrodynamic approximation. Our results are analyzed and compared with ones obtained for the kinetic approach. It is shown that in the framework of the hydrodynamic approach, as opposed to the kinetic approach, one general solution for DAW can be obtained in a finite and high pressure plasma. In a very low damping region, the kinetic and hydrodynamic solutions agreed very well, but there exist parameter regions where the solutions are essentially different, especially for high pressure plasma. The influence of astrophysical environment parameters on the DAW behaviour and properties is analyzed. All of the main wave characteristics, namely, dispersion, damping, polarization, density perturbation, and charge density perturbation, are obtained. Since a finite pressure plasma is one of most abundant among astrophysical plasma conditions, consideration of behaviour features of such waves is very important for their observations and detection as well as for more correct understanding of the behaviour and role of such waves in various astrophysical processes of cosmic environment.

Keywords: Alfven waves, hydrodynamics, plasma

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