Probing sunspots with two-skip time-distance helioseismology

Thomas L Duvall Jr, Paul Stuart Cally, Damien Przybylski, Kaori Nagashima, Gizon Dr., Laurent

Research output: Contribution to journalArticleResearchpeer-review

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.

Original languageEnglish
Article numberA73
Number of pages11
JournalAstronomy and Astrophysics
Volume613
DOIs
Publication statusPublished - 1 May 2018

Keywords

  • Sun: helioseismology
  • Sunspots

Cite this

Duvall Jr, Thomas L ; Cally, Paul Stuart ; Przybylski, Damien ; Nagashima, Kaori ; Laurent, Gizon Dr.,. / Probing sunspots with two-skip time-distance helioseismology. In: Astronomy and Astrophysics. 2018 ; Vol. 613.
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Probing sunspots with two-skip time-distance helioseismology. / Duvall Jr, Thomas L; Cally, Paul Stuart; Przybylski, Damien; Nagashima, Kaori; Laurent, Gizon Dr.,.

In: Astronomy and Astrophysics, Vol. 613, A73, 01.05.2018.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Probing sunspots with two-skip time-distance helioseismology

AU - Duvall Jr, Thomas L

AU - Cally, Paul Stuart

AU - Przybylski, Damien

AU - Nagashima, Kaori

AU - Laurent, Gizon Dr.,

PY - 2018/5/1

Y1 - 2018/5/1

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AB - 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.

KW - Sun: helioseismology

KW - Sunspots

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