Damping of coronal loop oscillations: resonant absorption at work

Details Damping of coronal loop oscillations: resonant absorption at work Damping of coronal loop oscillations: resonant absorption at work

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..745r&link_type=abstract

In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze

Physics

Solar Corona, Magnetic Loops, Oscillations, Damping

Scientific paper

Motivated by recent TRACE observations of damped oscillations in coronal loops, we consider analytically the motion of an inhomogeneous coronal magnetic tube of radius α in a zero β plasma. An initially perturbed tube may vibrate in its kink mode of oscillation with the frequency ωk but those vibrations are damped. The damping is due to resonant absorption, acting in the inhomogeneous regions of the tube, which leads to a transfer of energy from the kink mode to azimuthal oscillations within the inhomogeneous layer. We determine explicitly the decay decrement γ for a coronal flux tube whose plasma density varies in a thin layer of thickness l<

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