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Probing sunspots with two-skip time–distance helioseismology

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Duvall,  Thomas
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

Przybylski,  Damien
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

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Nagashima,  Kaori
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

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Gizon,  Laurent
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0003-2AD4-F
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.