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Magnetic fields inferred by Solar Orbiter: A comparison between SO/PHI-HRT and SDO/HMI

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Magnetic fields inferred by Solar Orbiter: A comparison between SO/PHI-HRT and SDO/HMI

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dc.contributor.author	Sinjan, J.
dc.contributor.author	Alvarez Herrero, A.
dc.contributor.author	Sanchis Kilders, Esteban
dc.contributor.author	Pérez Grande, Isabel
dc.contributor.author	Orozco Suárez, D.
dc.contributor.author	Albelo Jorge, N.
dc.contributor.author	Gómez Cama, J. M.
dc.contributor.author	del Toro Iniesta, J. C.
dc.contributor.author	Gutiérrez Márquez, P.
dc.contributor.author	Moreno Vacas, A.
dc.contributor.author	Bellot Rubio, L. R.
dc.contributor.author	Balaguer Jiménez, M.
dc.contributor.author	Blanco Rodríguez, Julian
dc.date.accessioned	2023-11-24T12:10:59Z
dc.date.available	2023-11-24T12:10:59Z
dc.date.issued	2023
dc.identifier.uri	https://hdl.handle.net/10550/91405
dc.description.abstract	Context. The High Resolution Telescope (HRT) of the Polarimetric and Helioseismic Imager on board the Solar Orbiter spacecraft (SO/PHI) and the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) both infer the photospheric magnetic field from polarised light images. SO/PHI is the first magnetograph to move out of the Sun-Earth line and will provide unprecedented access to the Sun's poles. This provides excellent opportunities for new research wherein the magnetic field maps from both instruments are used simultaneously. Aims. We aim to compare the magnetic field maps from these two instruments and discuss any possible di erences between them. Methods. We used data from both instruments obtained during Solar Orbiter's inferior conjunction on 7 March 2022. The HRT data were additionally treated for geometric distortion and degraded to the same resolution as HMI. The HMI data were re-projected to correct for the 3 separation between the two observatories. Results. SO/PHI-HRT and HMI produce remarkably similar line-of-sight magnetograms, with a slope coe cient of 0:97, an o set below 1 G, and a Pearson correlation coe cient of 0:97. However, SO/PHI-HRT infers weaker line-of-sight fields for the strongest fields. As for the vector magnetic field, SO/PHI-HRT was compared to both the 720-second and 90-second HMI vector magnetic field: SO/PHI-HRT has a closer alignment with the 90-second HMI vector. In the weak signal regime (<600 G), SO/PHI-HRT measures stronger and more horizontal fields than HMI, very likely due to the greater noise in the SO/PHI-HRT data. In the strong field regime (≳600 G), HRT infers lower field strengths but with similar inclinations (a slope of 0:92) and azimuths (a slope of 1:02). The slope values are from the comparison with the HMI 90-second vector. Possible reasons for the di erences found between SO/PHI-HRT and HMI magnetic field parameters are discussed.
dc.language.iso	eng
dc.relation.ispartof	Astronomy & Astrophysics, 2023, vol. 673, num. A31, p. 1-10
dc.source	Sinjan, J. et al. (2023). Magnetic fields inferred by Solar Orbiter: A comparison between SO/PHI-HRT and SDO/HMI. Astronomy & Astrophysics, 673, A31, 1-10. https://doi.org/10.1051/0004-6361/202245830
dc.subject	astronomia
dc.subject	física
dc.subject	astrofísica
dc.subject	electrònica
dc.subject	photosphere
dc.subject	magnetic fields
dc.subject	sun
dc.subject	space vehicles
dc.title	Magnetic fields inferred by Solar Orbiter: A comparison between SO/PHI-HRT and SDO/HMI
dc.type	journal article
dc.date.updated	2023-11-24T12:11:00Z
dc.identifier.doi	10.1051/0004-6361/202245830
dc.identifier.idgrec	158598
dc.rights.accessRights	open access