A Statistical Study of Propagating MHD Kink Waves in the Quiescent Corona

Ajay Tiwari*, Richard Morton, James McLaughlin

*Corresponding author for this work

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Abstract

The Coronal Multi-channel Polarimeter (CoMP) has opened up exciting opportunities to probe transverse MHD waves in the Sun’s corona. The archive of CoMP data is utilized to generate a catalog of quiescent coronal loops that can be used for studying propagating kink waves. The catalog contains 120 loops observed between 2012 and 2014. This catalog is further used to undertake a statistical study of propagating kink waves in the quiet regions of the solar corona, investigating phase speeds, loop lengths, footpoint power ratio (a measure of wave power entering the corona through each footpoint of a loop) and equilibrium parameter (which provides a measure of the change in wave amplitude) values. The statistical study enables us to establish the presence of a relationship between the rate of damping and the length of the coronal loop, with longer coronal loops displaying weaker wave damping. We suggest the reason for this behavior is related to a decreasing average density contrast between the loop and ambient plasma as loop length increases. The catalog presented here will provide the community with the foundation for the further study of propagating kink waves in the quiet solar corona.
Original languageEnglish
Article number74
Pages (from-to)1-10
Number of pages10
JournalThe Astrophysical Journal
Volume919
Issue number2
Early online date28 Sep 2021
DOIs
Publication statusPublished - 1 Oct 2021

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