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Nonlinear studies of coronal heating by the resonant absorption of Alfvén waves
Author(s) -
Ofman L.,
Davila J. M.,
Steinolfson R. S.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl01416
Subject(s) - physics , magnetohydrodynamics , dissipation , instability , plasma , absorption (acoustics) , mechanics , computational physics , optics , thermodynamics , quantum mechanics
The first nonlinear study of the instability of the resonant absorption is presented in this paper. The nonlinear evolution of the resonant absorption of Alfvén waves in an inhomogeneous plasma is studied via solution of the time‐dependent 3‐D, low‐β, resistive MHD equations. Highly sheared velocities that are subject to the Kelvin‐Helmholtz like instability are found at the narrow dissipation layers. Three dimensional Kelvin‐Helmholtz like vortices appear at and near the dissipation layers and propagate along the slab of plasma. The narrow resonant heating layers are deformed by the self‐consistent shear flow. In the solar active regions where the resonant absorption of Alfvén waves is believed to occur the instability may lead to turbulent enhancement of the dissipation parameters and account for the observed turbulent velocities inferred from the non‐thermal broadening of x‐ray and EUV emission lines.