Attenuation of Alfvén waves in straight and curved coronal slabs

Details Attenuation of Alfvén waves in straight and curved coronal slabs Attenuation of Alfvén waves in straight and curved coronal slabs

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...469.1117g&link_type=abstract

Astronomy and Astrophysics, Volume 469, Issue 3, July III 2007, pp.1117-1121

Astronomy and Astrophysics

Astrophysics

11

Magnetohydrodynamics (Mhd), Sun: Corona, Sun: Oscillations

Scientific paper

Aims:We consider impulsively generated Alfvén waves in coronal loops to investigate the role of energy leakage on wave attenuation, which includes lateral leakage, leakage into dense photospheric regions and nonlinear driving of magnetosonic waves. Methods: A coronal loop is modelled either as a straight magnetic slab or as a curved slab of smooth mass density profiles. We perform numerical simulations of 2.5D ideal magnetohydrodynamic equations to determine the signatures of Alfvén waves. Results: The numerical results show that lateral leakage of Alfvén waves is significant in comparison to leakage into the photospheric regions for realistic corona to photospheric density ratios. Energy leakage is enhanced by curvature of magnetic field lines and for large amplitude Alfvén waves for which nonlinear driving of magnetosonic waves is more significant than in the linear regime.

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