Dissipation of Alfvén waves in compressible inhomogeneous media.

Details Dissipation of Alfvén waves in compressible inhomogeneous media. Dissipation of Alfvén waves in compressible inhomogeneous media.

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ncimc..20..903m&link_type=abstract

Nuovo Cimento C, Vol. 20C, N. 6, p. 903 - 909

Computer Science

1

Magnetohydrodynamics: Solar Corona, Magnetohydrodynamics: Plasma

Scientific paper

In weakly dissipative media governed by the magnetohydrodynamics (MHD) equations, any efficient mechanism of energy dissipation requires the formation of small scales. Using numerical simulations, the authors study the properties of Alfvén waves propagating in a compressible inhomogeneous medium, with an inhomogeneity transverse to the direction of wave propagation. Two dynamical effects, energy pinching and phase mixing, are responsible for the small-scales formation, similarly to the incompressible case. Moreover, compressive perturbations, slow waves and a static entropy wave are generated; the former are subject to steepening and form shock waves, which efficiently dissipate their energy, regardless of the Reynolds number. Rough estimates show that the dissipation times are consistent with those required to dissipate Alfvén waves of photospheric origin inside the solar corona.

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