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Atmospheric radiation boundary conditions for high frequency waves in time-distance helioseismology

hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorFOURNIER, Damien
hal.structure.identifierInstitut für Astrophysik [Göttingen]
dc.contributor.authorLEGUÈBE, Michaël
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
dc.contributor.authorHANSON, Chris S.
hal.structure.identifierInstitut für Astrophysik [Göttingen]
hal.structure.identifierMax-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research [MPS]
hal.structure.identifierNew York University [Abu Dhabi]
dc.contributor.authorGIZON, Laurent
hal.structure.identifierAdvanced 3D Numerical Modeling in Geophysics [Magique 3D]
hal.structure.identifierUniversité de Pau et des Pays de l'Adour [UPPA]
dc.contributor.authorBARUCQ, Hélène
hal.structure.identifierAdvanced 3D Numerical Modeling in Geophysics [Magique 3D]
dc.contributor.authorCHABASSIER, Juliette
hal.structure.identifierAdvanced 3D Numerical Modeling in Geophysics [Magique 3D]
hal.structure.identifierInstitut de Mathématiques de Bordeaux [IMB]
dc.contributor.authorDURUFLÉ, Marc
dc.date.accessioned2024-04-04T03:07:24Z
dc.date.available2024-04-04T03:07:24Z
dc.date.issued2017
dc.identifier.issn0004-6361
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/193439
dc.description.abstractEnThe temporal covariance between seismic waves measured at two locations on the solar surface is the fundamental observable in time-distance helioseismology. Above the acoustic cutoff frequency (∼5.3 mHz), waves are not trapped in the solar interior and the covariance function can be used to probe the upper atmosphere. We wish to implement appropriate radiative boundary conditions for computing the propagation of high-frequency waves in the solar atmosphere. We consider the radiative boundary conditions recently developed by Barucq et al. (2017) for atmospheres in which sound-speed is constant and density decreases exponentially with radius. We compute the cross-covariance function using a finite element method in spherical geometry and in the frequency domain. The ratio between first-and second-skip amplitudes in the time-distance diagram is used as a diagnostic to compare boundary conditions and to compare with observations. We find that a boundary condition applied 500 km above the photosphere and derived under the approximation of small angles of incidence accurately reproduces the 'infinite atmosphere' solution for high-frequency waves. When the radiative boundary condition is applied 2 Mm above the photosphere, we find that the choice of atmospheric model affects the time-distance diagram. In particular, the time-distance diagram exhibits double-ridge structure when using a VAL atmospheric model.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enAtmospheric radiation boundary conditions for high frequency waves in time-distance helioseismology
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201731283
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page1-9
bordeaux.volume608
bordeaux.hal.laboratoriesInstitut de Mathématiques de Bordeaux (IMB) - UMR 5251*
bordeaux.issueA109
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.peerReviewedoui
hal.identifierhal-01622697
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01622697v1
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