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Spectropolarimetric investigation of magnetohydrodynamic wave modes in the photosphere: First results from PHI on board Solar Orbiter.

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Spectropolarimetric investigation of magnetohydrodynamic wave modes in the photosphere: First results from PHI on board Solar Orbiter.

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dc.contributor.author	Calchetti, D.
dc.contributor.author	Blanco Rodríguez, Julian
dc.contributor.author	Sanchis Kilders, Esteban
dc.contributor.author	Albelo Jorge, N.
dc.contributor.author	Alvarez Herrero, A.
dc.contributor.author	Balaguer Jiménez, M.
dc.contributor.author	Bellot Rubio, L.R.
dc.contributor.author	Gutiérrez Márquez, P.
dc.contributor.author	Moreno Vacas, A.
dc.contributor.author	Orozco Suárez, D.
dc.contributor.author	Pérez Grande, Isabel
dc.contributor.author	del Toro Iniesta, J. C.
dc.date.accessioned	2023-11-27T11:50:56Z
dc.date.available	2023-11-27T11:50:56Z
dc.date.issued	2023
dc.identifier.uri	https://hdl.handle.net/10550/91454
dc.description.abstract	Context. In November 2021, Solar Orbiter started its nominal mission phase. The remote-sensing instruments on board the spacecraft acquired scientific data during three observing windows surrounding the perihelion of the first orbit of this phase. Aims. The aim of the analysis is the detection of magnetohydrodynamic (MHD) wave modes in an active region by exploiting the capabilities of spectropolarimetric measurements. Methods. The High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (SO/PHI) on board the Solar Orbiter acquired a high-cadence data set of an active region. This is studied in the paper. B-ω and phase-difference analyses are applied on line-of-sight velocity and circular polarization maps and other averaged quantities. Results. We find that several MHD modes at different frequencies are excited in all analysed structures. The leading sunspot shows a linear dependence of the phase lag on the angle between the magnetic field and the line of sight of the observer in its penumbra. The magnetic pore exhibits global resonances at several frequencies, which are also excited by different wave modes. Conclusions. The SO/PHI measurements clearly confirm the presence of magnetic and velocity oscillations that are compatible with one or more MHD wave modes in pores and a sunspot. Improvements in modelling are still necessary to interpret the relation between the fluctuations of different diagnostics.
dc.language.iso	eng
dc.relation.ispartof	Astronomy and Astrophysics, 2023, vol. 674, num. A109
dc.source	Calchetti, D. et al. (2023). Spectropolarimetric investigation of magnetohydrodynamic wave modes in the photosphere: First results from PHI on board Solar Orbiter. Astronomy and Astrophysics 674 A109. https://doi.org/10.1051/0004-6361/202245826
dc.subject	astronomia
dc.subject	astrofísica
dc.subject	física
dc.subject	electrònica
dc.subject	magnetic fields
dc.subject	photosphere
dc.subject	oscillations
dc.title	Spectropolarimetric investigation of magnetohydrodynamic wave modes in the photosphere: First results from PHI on board Solar Orbiter.
dc.type	journal article
dc.date.updated	2023-11-27T11:50:57Z
dc.identifier.doi	10.1051/0004-6361/202245826
dc.identifier.idgrec	162137
dc.rights.accessRights	open access