Coronal loop oscillations Calculation of resonantly damped MHD quasi-mode kink oscillations of longitudinally stratified loops
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In this article, the authors generalize the model by including longitudinal density stratification and examine how the longitudinaldensity stratification alters the linear eigenmodes of the system, their oscillation frequencies, and the damping rates by resonant absorption.Abstract:
The observed coronal loop oscillations and their damping are often theoretically described by the use of a very simple coronal loop model, viz. a straight, longitudinally invariant, axi-symmetric, and pressureless flux tube with a different density inside and outside of the loop. In this paper we generalize the model by including longitudinal density stratification and we examine how the longitudinal density stratification alters the linear eigenmodes of the system, their oscillation frequencies, and the damping rates by resonant absorption.read more
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References
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Journal ArticleDOI
TRACE observation of damped coronal loop oscillations: implications for coronal heating
TL;DR: The imaging telescope on board the Transition Region and Coronal Explorer spacecraft observed the decaying transversal oscillations of a long and thin coronal loop in the 171 angstrom Fe(IX) emission line, finding the coronal dissipation coefficient to be eight to nine orders of magnitude larger than the theoretically predicted classical value.
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Coronal Loop Oscillations Observed with the Transition Region and Coronal Explorer
TL;DR: In this article, spatial oscillations of coronal loops were detected in extreme-ultraviolet wavelengths (171 with the T ransition Region and Coronal Explorer, in the tem- Ae ) perature range of MK.
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Resonant absorption of Alfvenic surface waves and the heating of solar coronal loops
TL;DR: In this article, a first-order mass and energy-balance model is developed for steady-state EUV 'coronal rain' loops that are not associated with postflare events and are often seen over sunspot umbrae.
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The Damping of Coronal Loop Oscillations
Michael S. Ruderman,B. Roberts +1 more
TL;DR: In this paper, the authors show that a coronal flux tube with inhomogeneities on a small scale (confined to within a thin layer of order a�=! k in thickness) is able to support coherent oscillations for any length of time and so be observable.
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Coronal loop oscillations - An interpretation in terms of resonant absorption of quasi-mode kink oscillations
TL;DR: In this paper, the authors used the theoretical expressions for the decay time by Hollweg & Yang and Ruderman & Roberts to estimate the ratio of the length scale of inhomogeneity compared to the loop radius for a collection of loop oscillations.