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The ratio of horizontal to vertical displacement in solar oscillations estimated from combined SO/PHI and SDO/HMI observations

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The ratio of horizontal to vertical displacement in solar oscillations estimated from combined SO/PHI and SDO/HMI observations

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dc.contributor.author	Schou, J.
dc.contributor.author	Blanco Rodríguez, Julian
dc.contributor.author	Gasent-Blesa, José Luis
dc.contributor.author	Sanchis Kilders, Esteban
dc.contributor.author	Albelo Jorge
dc.contributor.author	Orozco Suárez, D.
dc.contributor.author	Alvarez Herrero, A.
dc.contributor.author	Gutiérrez Márquez, P.
dc.contributor.author	Bellot Rubio, L.R.
dc.contributor.author	del Toro Iniesta, J.C.
dc.contributor.author	Balaguer Jiménez, M.
dc.contributor.author	Pérez Grande, Isabel
dc.date.accessioned	2023-11-27T11:25:56Z
dc.date.available	2023-11-27T11:25:56Z
dc.date.issued	2023
dc.identifier.uri	https://hdl.handle.net/10550/91452
dc.description.abstract	In order to make accurate inferences about the solar interior using helioseismology, it is essential to understand all the relevant physical effects on the observations. One effect to understand is the (complex-valued) ratio of the horizontal to vertical displacement of the p- and f-modes at the height at which they are observed. Unfortunately, it is impossible to measure this ratio directly from a single vantage point, and it has been difficult to disentangle observationally from other effects. In this paper we attempt to measure the ratio directly using 7.5 h of simultaneous observations from the Polarimetric and Helioseismic Imager on board Solar Orbiter and the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory. While image geometry problems make it difficult to determine the exact ratio, it appears to agree well with that expected from adiabatic oscillations in a standard solar model. On the other hand it does not agree with a commonly used approximation, indicating that this approximation should not be used in helioseismic analyses. In addition, the ratio appears to be real-valued.
dc.language.iso	eng
dc.relation.ispartof	Astronomy and Astrophysics, 2023, vol. 673, A84
dc.source	Schou, J. et al. (2023). The ratio of horizontal to vertical displacement in solar oscillations estimated from combined SO/PHI and SDO/HMI observations. Astronomy and Astrophysics 673 A84. https://doi.org/10.1051/0004-6361/202345946
dc.subject	astronomia
dc.subject	astrofísica
dc.subject	física
dc.subject	electrònica
dc.subject	helioseismology
dc.subject	photosphere
dc.title	The ratio of horizontal to vertical displacement in solar oscillations estimated from combined SO/PHI and SDO/HMI observations
dc.type	journal article
dc.date.updated	2023-11-27T11:25:57Z
dc.identifier.doi	10.1051/0004-6361/202345946
dc.identifier.idgrec	162135
dc.rights.accessRights	open access