Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances
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...
| Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/335832 |
| Acceso en línea: | http://hdl.handle.net/10261/335832 |
| Access Level: | acceso abierto |
| Palabra clave: | Sun: magnetic fields Sun: photosphere Instrumentation: polarimeters Methods: observational |
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Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distancesKahil, F.Gandorfer, A.Hirzberger, J.Calchetti, D.Sinjan, J.Valori, G.Solanki, S. K.Van Noort, M.Albert, K.Albelo Jorge, N.Alvarez-Herrero, A.Appourchaux, T.Bellot Rubio, Luis R.Blanco Rodríguez, J.Feller, A.Fiethe, B.Germerott, D.Gizon, L.Guerrero, L.Gutierrez-Marques, P.Kolleck, M.Korpi-Lagg, A.Michalik, H.Moreno Vacas, AlejandroOrozco Suárez, DavidPérez Grande, IsabelSanchis Kilders, EstebanSchou, J.Schühle, U.Staub, J.Strecker, H.Toro, José Carlos delVolkmer, R.Woch, J.Sun: magnetic fieldsSun: photosphereInstrumentation: polarimetersMethods: observationalAims. 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. © The Authors 2023.Solar Orbiter is a space mission of international collaboration between ESA and NASA, operated by ESA. We are grateful to the ESA SOC and MOC teams for their support. The German contribution to SO/PHI is funded by the BMWi through DLR and by MPG central funds. The Spanish contribution is funded by FEDER/AEI/MCIU (RTI2018-096886-C5), a “Center of Excellence Severo Ochoa” award to IAA-CSIC (SEV-2017-0709), and a Ramón y Cajal fellowship awarded to DOS. The French contribution is funded by CNES.With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (SEV-2017-0709).Peer reviewedEDP SciencesMinisterio de Ciencia, Innovación y Universidades (España)European CommissionCentre National D'Etudes Spatiales (France)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202320232023info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/335832reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI//SEV-2017-0709info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-096886-B-C51http://dx.doi.org/10.1051/0004-6361/202346033Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3358322026-05-22T06:33:51Z |
| dc.title.none.fl_str_mv |
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances |
| title |
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances |
| spellingShingle |
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances Kahil, F. Sun: magnetic fields Sun: photosphere Instrumentation: polarimeters Methods: observational |
| title_short |
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances |
| title_full |
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances |
| title_fullStr |
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances |
| title_full_unstemmed |
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances |
| title_sort |
Wavefront error of PHI/HRT on Solar Orbiter at various heliocentric distances |
| dc.creator.none.fl_str_mv |
Kahil, F. Gandorfer, A. Hirzberger, J. Calchetti, D. Sinjan, J. Valori, G. Solanki, S. K. Van Noort, M. Albert, K. Albelo Jorge, N. Alvarez-Herrero, A. Appourchaux, T. Bellot Rubio, Luis R. Blanco Rodríguez, J. Feller, A. Fiethe, B. Germerott, D. Gizon, L. Guerrero, L. Gutierrez-Marques, P. Kolleck, M. Korpi-Lagg, A. Michalik, H. Moreno Vacas, Alejandro Orozco Suárez, David Pérez Grande, Isabel Sanchis Kilders, Esteban Schou, J. Schühle, U. Staub, J. Strecker, H. Toro, José Carlos del Volkmer, R. Woch, J. |
| author |
Kahil, F. |
| author_facet |
Kahil, F. Gandorfer, A. Hirzberger, J. Calchetti, D. Sinjan, J. Valori, G. Solanki, S. K. Van Noort, M. Albert, K. Albelo Jorge, N. Alvarez-Herrero, A. Appourchaux, T. Bellot Rubio, Luis R. Blanco Rodríguez, J. Feller, A. Fiethe, B. Germerott, D. Gizon, L. Guerrero, L. Gutierrez-Marques, P. Kolleck, M. Korpi-Lagg, A. Michalik, H. Moreno Vacas, Alejandro Orozco Suárez, David Pérez Grande, Isabel Sanchis Kilders, Esteban Schou, J. Schühle, U. Staub, J. Strecker, H. Toro, José Carlos del Volkmer, R. Woch, J. |
| author_role |
author |
| author2 |
Gandorfer, A. Hirzberger, J. Calchetti, D. Sinjan, J. Valori, G. Solanki, S. K. Van Noort, M. Albert, K. Albelo Jorge, N. Alvarez-Herrero, A. Appourchaux, T. Bellot Rubio, Luis R. Blanco Rodríguez, J. Feller, A. Fiethe, B. Germerott, D. Gizon, L. Guerrero, L. Gutierrez-Marques, P. Kolleck, M. Korpi-Lagg, A. Michalik, H. Moreno Vacas, Alejandro Orozco Suárez, David Pérez Grande, Isabel Sanchis Kilders, Esteban Schou, J. Schühle, U. Staub, J. Strecker, H. Toro, José Carlos del Volkmer, R. Woch, J. |
| author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Ministerio de Ciencia, Innovación y Universidades (España) European Commission Centre National D'Etudes Spatiales (France) Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Sun: magnetic fields Sun: photosphere Instrumentation: polarimeters Methods: observational |
| topic |
Sun: magnetic fields Sun: photosphere Instrumentation: polarimeters Methods: observational |
| description |
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. © The Authors 2023. |
| publishDate |
2023 |
| dc.date.none.fl_str_mv |
2023 2023 2023 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article http://purl.org/coar/resource_type/c_6501 Publisher's version info:eu-repo/semantics/publishedVersion |
| format |
article |
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publishedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/335832 |
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http://hdl.handle.net/10261/335832 |
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Inglés |
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Inglés |
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#PLACEHOLDER_PARENT_METADATA_VALUE# #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/AEI//SEV-2017-0709 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-096886-B-C51 http://dx.doi.org/10.1051/0004-6361/202346033 Sí |
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info:eu-repo/semantics/openAccess |
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openAccess |
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EDP Sciences |
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EDP Sciences |
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reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
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Consejo Superior de Investigaciones Científicas (CSIC) |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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15,81155 |