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Spectroscopic detection of Alfvénic waves in the chromosphere of sunspot regions

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Chae, Jongchul, Cho, Kyuhyoun, Nakariakov, V. M. (Valery M.), Cho, Kyung-Suk and Kwon, Ryun-Young (2021) Spectroscopic detection of Alfvénic waves in the chromosphere of sunspot regions. Astrophysical Journal, 914 (1). L16. doi:10.3847/2041-8213/ac052b ISSN 0004-637X.

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Official URL: https://doi.org/10.3847/2041-8213/ac052b

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Abstract

Transverse magnetohydrodynamic waves often called Alfvénic (or kink) waves have been often theoretically put forward to solve the outstanding problems of the solar corona like coronal heating, solar wind acceleration, and chemical abundance enhancement. Here we report the first spectroscopic detection of Alfvénic waves around a sunspot at chromospheric heights. By analyzing the spectra of the Hα line and Ca ii 854.2 nm line, we determined line-of-sight velocity and temperature as functions of position and time. As a result, we identified transverse magnetohydrodynamic waves pervading the superpenumbral fibrils. These waves are characterized by the periods of 2.5 to 4.5 minutes, and the propagation direction parallel to the fibrils, the supersonic propagation speeds of 45 to 145 km s−1, and the close association with umbral oscillations and running penumbral waves in sunspots. Our results support the notion that the chromosphere around sunspots abounds with Alfvénic waves excited by the mode conversion of the upward-propagating slow magnetoacoustic waves.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Sunspots, Magnetohydrodynamic waves, Solar chromosphere, Solar atmosphere, Astronomical spectroscopy
Journal or Publication Title: Astrophysical Journal
Publisher: IOP Publishing
ISSN: 0004-637X
Official Date: 10 June 2021
Dates:
DateEvent
10 June 2021Published
25 May 2021Accepted
Volume: 914
Number: 1
Article Number: L16
DOI: 10.3847/2041-8213/ac052b
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This is an author-created, un-copyedited version of an article accepted for publication in Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.3847/2041-8213/ac052b
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: © 2021. The American Astronomical Society. All rights reserved.
Date of first compliant deposit: 27 May 2021
Date of first compliant Open Access: 10 June 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
NRF-2020R1A2C2004616National Research Foundation of Koreahttp://dx.doi.org/10.13039/501100003725
NRF-2020R1I1A1A01068789National Research Foundation of Koreahttp://dx.doi.org/10.13039/501100003725
ST/T000252/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
Is Part Of: 1
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