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Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances

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Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances

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dc.contributor.author	Kahil, F.
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	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	2023-11-27T11:59:38Z
dc.date.available	2023-11-27T11:59:38Z
dc.date.issued	2023
dc.identifier.uri	https://hdl.handle.net/10550/91455
dc.description.abstract	Aims. We use wavefront sensing to characterise the image quality of the High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager (SO/PHI) data products during the second remote sensing window of the Solar Orbiter (SO) nominal mission phase. Our ultimate aims are to reconstruct the HRT data by deconvolving with the HRT point spread function (PSF) and to correct for the effects of optical aberrations on the data. Methods. We use a pair of focused-defocused images to compute the wavefront error and derive the PSF of HRT by means of a phase diversity (PD) analysis. Results. The wavefront error of HRT depends on the orbital distance of SO to the Sun. At distances > 0.5 au, the wavefront error is small, and stems dominantly from the inherent optical properties of HRT. At distances < 0.5 au, the thermo-optical effect of the Heat Rejection Entrance Window (HREW) becomes noticeable. We develop an interpolation scheme for the wavefront error that depends on the thermal variation of the HREW with the distance of SO to the Sun. We also introduce a new level of image reconstruction, termed 'aberration correction', which is designed to reduce the noise caused by image deconvolution while removing the aberrations caused by the HREW. Conclusions. The computed PSF via phase diversity significantly reduces the degradation caused by the HREW in the near-perihelion HRT data. In addition, the aberration correction increases the noise by a factor of only 1.45 compared to the factor of 3 increase that results from the usual PD reconstructions.
dc.language.iso	eng
dc.relation.ispartof	Astronomy and Astrophysics, 2023, vol. 675, num. A61
dc.source	Kahil, F. et al. (2023). Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances. Astronomy and Astrophysics 675 A61 1 11. https://doi.org/10.1051/0004-6361/202346033
dc.subject	astronomia
dc.subject	astrofísica
dc.subject	física
dc.subject	electrònica
dc.subject	magnetic fields
dc.subject	photosphere
dc.subject	polarimeters
dc.title	Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances
dc.type	journal article
dc.date.updated	2023-11-27T11:59:39Z
dc.identifier.doi	10.1051/0004-6361/202346033
dc.identifier.idgrec	162138
dc.rights.accessRights	open access