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

Sinjan, J.; Calchetti, D.; Hirzberger, J.; Kahil, F.; Valori, G.; Solanki, S. K.; Albert, K.; Albelo Jorge, N.; Alvarez-Herrero, A.; Appourchaux, T.; Bellot Rubio, L. R.; Blanco Rodríguez, J.; Feller, A.; Gandorfer, A.; Germerott, D.; Gizon, L.; Gómez Cama, J. M.; Guerrero, L.; Gutierrez-Marques, P.; Kolleck, M.; Korpi-Lagg, A.; Michalik, H.; Moreno Vacas, A.; Orozco Suárez, D.; Pérez-Grande, I.; Sanchis Kilders, E.; Balaguer Jiménez, M.; Schou, J.; Schühle, U.; Staub, J.; Strecker, H.; del Toro Iniesta, J. C.; Volkmer, R.; Woch, J.

doi:10.1051/0004-6361/202245830

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

MPG-Autoren

/persons/resource/persons103966

Hirzberger, J.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons209278

Kahil, F.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
International Max Planck Research School for Solar System Science at the University of Göttingen, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons274392

Valori, G.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons104218

Solanki, S. K.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons231801

Albert, K.
IMPRS for Solar System Science at the University of Göttingen, Max Planck Institute for Solar System Research, Max Planck Society;
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons103910

Feller, A.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons103917

Gandorfer, A.
MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons103923

Germerott, D.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;
MPI for Aeronomy, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons103925

Gizon, L.
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons103944

Gutierrez-Marques, P.
Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons104018

Kolleck, M.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons104044

Korpi-Lagg, A.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons129829

Schou, J.
Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons104197

Schühle, U.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons31086

Strecker, H.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

/persons/resource/persons104296

Woch, J.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

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https://ui.adsabs.harvard.edu/abs/2023A&A...673A..31S
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Zitation

Sinjan, J., Calchetti, D., Hirzberger, J., Kahil, F., Valori, G., Solanki, S. K., et al. (2023). Magnetic fields inferred by Solar Orbiter: A comparison between SO/PHI-HRT and SDO/HMI. Astronomy and Astrophysics, 673, A31. doi:10.1051/0004-6361/202245830.

Zitierlink: https://hdl.handle.net/21.11116/0000-000D-16EE-F

Zusammenfassung

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 differences 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 coefficient of 0.97, an offset below 1 G, and a Pearson correlation coefficient 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 differences found between SO/PHI-HRT and HMI magnetic field parameters are discussed.