One-sided arc averaging geometries in time-distance local helioseismology

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dc.contributor.author Korda, David
dc.contributor.author Svanda, Michal
dc.contributor.author Roudier, Thierry
dc.date.accessioned 2021-10-29T12:34:02Z
dc.date.available 2021-10-29T12:34:02Z
dc.date.issued 2021-10-14
dc.identifier.citation Korda , D , Svanda , M & Roudier , T 2021 , ' One-sided arc averaging geometries in time-distance local helioseismology ' , Astronomy & Astrophysics , vol. 654 , 84 . https://doi.org/10.1051/0004-6361/202140580
dc.identifier.other PURE: 169883070
dc.identifier.other PURE UUID: cb672647-22fb-4310-87b3-df21762a9ffb
dc.identifier.other WOS: 000707189400001
dc.identifier.other ORCID: /0000-0002-4227-251X/work/102286705
dc.identifier.other Scopus: 85117315950
dc.identifier.uri http://hdl.handle.net/10138/335839
dc.description.abstract Context. The study of solar oscillations (helioseismology) has been a very successful method of researching the Sun. Helioseismology teaches us about the structure and mean properties of the Sun. Together with mid-resolution data, the local properties were uncovered in quiet-Sun regions. However, magnetic fields affect the oscillations and prevent us from studying the properties of magnetically active regions with helioseismology. Aims. We aim to create a new methodology to suppress the negative effects of magnetic fields on solar oscillations and measure plasma properties close to active regions. Methods. The methodology consists of new averaging geometries, a non-linear approach to travel-time measurements, and a consistent inversion method that combines plasma flows and sound-speed perturbations. Results. We constructed the one-sided arc averaging geometries and applied them to the non-linear approach of travel-time measurements. Using the one-sided arc travel times, we reconstructed the annulus travel times in a quiet-Sun region. We tested the methodology against the validated helioseismic inversion pipeline. We applied the new methodology for an inversion for surface horizontal flows in a region with a circular H-type sunspot. The inverted surface horizontal flows are comparable with the output of the coherent structure tracking, which is not strongly affected by the presence of the magnetic field. We show that the new methodology suppresses the negative effects of magnetic fields up to outer penumbra. We measure divergent flows with properties comparable to the moat flow. Conclusions. The new methodology can teach us about the depth structure of active regions and physical conditions that contribute to the evolution of the active regions. en
dc.format.extent 14
dc.language.iso eng
dc.relation.ispartof Astronomy & Astrophysics
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject 1171 Geosciences
dc.title One-sided arc averaging geometries in time-distance local helioseismology en
dc.type Article
dc.contributor.organization Department of Geosciences and Geography
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1051/0004-6361/202140580
dc.relation.issn 0004-6361
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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