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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
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WRAP-spectroscopic-detection-Alfvénic waves-chromosphere-sunspot-regions-Nakariakov-2021.pdf - Accepted Version - Requires a PDF viewer. Download (1728Kb) | Preview |
Official URL: https://doi.org/10.3847/2041-8213/ac052b
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 | ||||||||||||
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| 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: |
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| 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. | ||||||||||||
| RIOXX Funder/Project Grant: |
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