Dissipation of Alfven waves in compressible inhomogeneous media

Malara, F. and Primavera, L. and Veltri, P. (1997) Dissipation of Alfven waves in compressible inhomogeneous media. Il nuovo cimento C, 20 C (6). pp. 903-910. ISSN 1826-9885

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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, we study the properties of Alfv´en waves propagating in a compressible inhomegeneous 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 Alfv´en waves of photospheric origin inside the solar corona.

Item Type: Article
Additional Information: Paper presented at the VII Cosmic Physics National Conference, Rimini, October 26-28, 1994.
Uncontrolled Keywords: Corona; coronal loops, streamers, and holes; magnetohydrodynamic waves; conference proceedings
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 09 Feb 2018 10:23
Last Modified: 09 Feb 2018 10:23
URI: http://eprints.bice.rm.cnr.it/id/eprint/12400

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