Coronal seismology using damping of propagating kink waves

D. J. Pascoe*, T. Van Doorsselaere, I. De Moortel

*Corresponding author for this work

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Abstract

We consider the use of propagating kink waves, such as those observed by the Coronal Multi-channel Polarimeter, as a diagnostic technique. The transverse structuring of the plasma may be inferred by the frequency-dependent wave damping, which is attributed to resonant absorption. We include the effect of reflection of waves at the loop footpoints, which leads to the asymmetry parameter, describing the ratio of driven wave power at the footpoints becoming weakly constrained. The classical model of resonant absorption based on an exponential damping profile significantly overestimates the damping rate in coronal loops with low density contrast ratios. The use of the exponential profile in an analysis of observations therefore leads to underestimates for the density contrast ratio and associated parameters such as the heating rate following phase mixing.
Original languageEnglish
Article number101
Number of pages10
JournalAstrophysical Journal
Volume929
Issue number1
Early online date18 Apr 2022
DOIs
Publication statusPublished - 18 Apr 2022

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