Probing sunspots with two-skip time-distance helioseismology

Thomas L. Duvall, Paul S. Cally, Damien Przybylski, Kaori Nagashima, Laurent Gizon

    Research output: Contribution to journalArticle

    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 (US)
    Article numberA73
    JournalAstronomy and Astrophysics
    Volume613
    DOIs
    StatePublished - May 1 2018

    Fingerprint

    helioseismology
    sunspots
    sunspot
    travel time
    travel
    solar phenomena
    reflected waves
    rays
    magnetic field
    magnetic fields
    modeling

    Keywords

    • Sun: helioseismology
    • Sunspots

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

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

    Probing sunspots with two-skip time-distance helioseismology. / Duvall, Thomas L.; Cally, Paul S.; Przybylski, Damien; Nagashima, Kaori; Gizon, Laurent.

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

    Research output: Contribution to journalArticle

    Duvall, TL, Cally, PS, Przybylski, D, Nagashima, K & Gizon, L 2018, 'Probing sunspots with two-skip time-distance helioseismology', Astronomy and Astrophysics, vol. 613, A73. https://doi.org/10.1051/0004-6361/201732424
    Duvall, Thomas L. ; Cally, Paul S. ; Przybylski, Damien ; Nagashima, Kaori ; Gizon, Laurent. / Probing sunspots with two-skip time-distance helioseismology. In: Astronomy and Astrophysics. 2018 ; Vol. 613.
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    AU - Gizon, Laurent

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