Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...172..327m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 172, no. 1-2, Jan. 1987, p. 327-331. NASA-NSF-supported research.
Astronomy and Astrophysics
Astrophysics
15
Magnetohydrodynamic Waves, Nonuniform Plasmas, Plasma Waves, Solar Atmosphere, Space Plasmas, Viscous Damping, Solar Corona, Solar Wind
Scientific paper
The Alfvén normal mode in a non-uniform, viscous plasma is investigated. Because the ideal hydromagnetic equation is singular in a non-uniform magnetic field, viscosity is included in order to regularize the equation, analogous to the removal of the singular point by resistivity (Mok and Einaudi, 1985). The eigenvalue equation is then solved numerically for a particular magnetic configuration. The real part of the frequency of this viscous normal mode is found to be similar to the one in the resistive case, while the damping is shown to be comparable, and sometimes to exceed, the resistive effect under certain conditions in which the Lundquist number is sufficiently large. The damping rate is evaluated for various plasma conditions corresponding to different parts of the solar atmosphere. The effects of viscosity are found to dominate resistivity in the quiet sun corona and solar wind.
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