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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 . (In Press)
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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 | ||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||
| Divisions: | Faculty of 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: | 2 May 2019 | ||||||||||||
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| Date of first compliant deposit: | 2 May 2019 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | In Press | ||||||||||||
| Publisher Statement: | 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 | ||||||||||||
| RIOXX Funder/Project Grant: |
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