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On the validity of nonlinear Alfvén resonance in space plasmas View all abstracts by submitter

Istvan Ballai   Submitted: 2008-12-01 06:38

In the approximation of linear dissipative magnetohydrodynamics (MHD) it can be shown that driven MHD waves in magnetic plasmas with high Reynolds number exhibit a near resonant behaviour if the frequency of the wave becomes equal to the local Alfvén (or slow) frequency of a magnetic surface. This near resonant behaviour is confined to a thin region, known as the dissipative layer, which embraces the resonant magnetic surface. Although driven MHD waves have small dimensionless amplitude far away from the resonant surface, this near-resonant behaviour in the dissipative layer may cause a breakdown of linear theory. Our aim is to study the nonlinear effects in Alfvén dissipative layer. In the present paper, the method of simplified matched asymptotic expansions developed for nonlinear slow resonant waves is used to describe nonlinear effects inside the Alfvén dissipative layer. The nonlinear corrections to resonant waves in the Alfvén dissipative layer are derived and it is proved that at the Alfvén resonance (with isotropic/anisotropic dissipation) wave dynamics can be described by the linear theory with great accuracy.

Authors: C.T.M. Clack, I. Ballai and M.S. Ruderman
Projects: None

Publication Status: Astron. & Astrophys. accepted
Last Modified: 2008-12-01 07:59
Go to main E-Print page  Multi-wavelength observations and modelling of a canonical solar flare  SUMER observations of the inverse Evershed effect in the transition region above a sunspot  Edit Entry  Download Preprint  Delete Entry 

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