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Observational evidence of resonantly damped propagating kink waves in the solar corona View all abstracts by submitter

Jaume Terradas   Submitted: 2010-07-08 01:12

In this Letter we establish clear evidence for the resonant absorption damping mechanism by analyzing observational data from the novel Coronal Multi-Channel Polarimeter (CoMP). This instrument has established that in the solar corona there are ubiquitous propagating low amplitude (approx1 km s-1) Alfvénic waves with a wide range of frequencies. Realistically interpreting these waves as the kink mode from magnetohydrodynamic (MHD) wave theory, they should exhibit a frequency dependent damping length due to resonant absorption, governed by the TGV relation showing that transversal plasma inhomogeneity in coronal magnetic flux tubes causes them to act as natural low-pass filters. It is found that observed frequency dependence on damping length (up to about 8 mHz) can be explained by the kink wave interpretation and furthermore, the spatially averaged equilibrium parameter describing the length scale of transverse plasma density inhomogeneity over a system of coronal loops is consistent with the range of values estimated from TRACE observations of standing kink modes.

Authors: G. Verth, M. Goossens, J. Terradas
Projects: None

Publication Status: ApJL (accepted)
Last Modified: 2010-07-09 19:22
Go to main E-Print page  Multiwavelength imaging and spectroscopy of chromospheric evaporation in an M-class solar flare  Shocks and Thermal Conduction Fronts in Retracting Reconnected Flux Tubes  Edit Entry  Download Preprint  Delete Entry 

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