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The physical nature of spiral wave patterns in sunspots

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Kang, Juhyung, Chae, Jongchul, Nakariakov, V. M. (Valery M.), Cho, Kyuhyoun, Kwak, Hannah and Lee, Kyeore (2019) The physical nature of spiral wave patterns in sunspots. Astrophysical Journal Letters, 877 . L9. doi:10.3847/2041-8213/ab1f6c ISSN 2041-8213.

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Official URL: https://doi.org/10.3847/2041-8213/ab1f6c

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Abstract

Recently spiral wave patterns (SWPs) have been detected in 3-min oscillations of sunspot umbrae, but the nature of this phenomenon has remained elusive. We present a theoretical model which interprets the observed SWPs as the superposition of two different azimuthal modes of slow magnetoacoustic waves driven below the surface in an untwisted and non-rotating magnetic cylinder. We apply this model to SWPs of the line-of-sight velocity in a pore observed by the Fast Imaging Solar Spectrograph installed at the 1.6 m Goode Solar Telescope. One- and two-armed SWPs were identified in instantaneous amplitudes of line-of-sight Doppler velocity maps of 3-min oscillations. The associated oscillation periods are about 160 seconds, and the durations are about5 minutes. In our theoretical model, the observed spiral structures are explained by the superposition of non-zero azimuthal modes driven 1600 km below the photosphere in the pore. The one-armed SWP is produced by the slow body sausage (m= 0) and kink(m= 1) modes, and the two-armed SWP is formed by the slow body sausage (m= 0)and fluting (m= 2) modes of the magnetic flux tube forming the pore.

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, Solar chromosphere
Journal or Publication Title: Astrophysical Journal Letters
Publisher: IOP Publishing Ltd
ISSN: 2041-8213
Official Date: 20 May 2019
Dates:
DateEvent
20 May 2019Published
2 May 2019Accepted
Volume: 877
Article Number: L9
DOI: 10.3847/2041-8213/ab1f6c
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): To protect the copyright in your article, the original copyright notice as it appears in the journal should be included in the credit
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: American Astronomical Society 2019
Date of first compliant deposit: 2 May 2019
Date of first compliant Open Access: 8 May 2019
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
NRF-2017R1A2B4004466National Research Foundation of Koreahttp://dx.doi.org/10.13039/501100003725
ST/P000320/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
BK21 plus programNational Research Foundation of Koreahttp://dx.doi.org/10.13039/501100003725
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