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  Probing sunspots with two-skip time–distance helioseismology

Duvall, T., Cally, P. S., Przybylski, D., Nagashima, K., & Gizon, L. (2018). Probing sunspots with two-skip time–distance helioseismology. Astronomy and Astrophysics, 613: A73. doi:10.1051/0004-6361/201732424.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-2AD4-F Version Permalink: http://hdl.handle.net/21.11116/0000-0003-2AD5-E
Genre: Journal Article

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 Creators:
Duvall, Thomas1, Author              
Cally, Paul S., Author
Przybylski, Damien1, Author
Nagashima, Kaori1, Author              
Gizon, Laurent1, Author              
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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Free keywords: Sun: helioseismology / sunspots
 Abstract: Context. Previous helioseismology of sunspots has been sensitive to both the structural and magnetic aspects of sunspot structure. Aims. We aim to develop a technique that is insensitive to the magnetic component so the two aspects can be more readily separated. Methods. We study waves reflected almost vertically from the underside of a sunspot. Time–distance helioseismology was used to measure travel times for the waves. Ray theory and a detailed sunspot model were used to calculate travel times for comparison. Results. It is shown that these large distance waves are insensitive to the magnetic field in the sunspot. The largest travel time differences for any solar phenomena are observed. Conclusions. With sufficient modeling effort, these should lead to better understanding of sunspot structure.

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Language(s): eng - English
 Dates: 2019-03-132018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/201732424
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: - Volume / Issue: 613 Sequence Number: A73 Start / End Page: - Identifier: Other: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1