Stereoscopic disambiguation of vector magnetograms: first applications to 
SO/PHI-HRT data

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

doi:10.1051/0004-6361/202345859

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Stereoscopic disambiguation of vector magnetograms: first applications to SO/PHI-HRT data

MPS-Authors

/persons/resource/persons274392

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

/persons/resource/persons283892

Calchetti, D.
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;

/persons/resource/persons291545

Löschl, P.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons103966

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

/persons/resource/persons231801

Albert, K.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons291346

Albelo, J. N.
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.
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;

/persons/resource/persons103925

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

/persons/resource/persons291348

Guerrero, L.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society;

/persons/resource/persons103944

Gutierrez-Marques, P.
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;

/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/persons292210

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

/persons/resource/persons104226

Staub, J.
Department Sun and Heliosphere, Max Planck Institute for Solar System Research, 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/2023arXiv230709907V
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Citation

Valori, G., Calchetti, D., Moreno Vacas, A., Pariat, É., Solanki, S. K., Löschl, P., et al. (2023). Stereoscopic disambiguation of vector magnetograms: first applications to SO/PHI-HRT data. Astronomy and Astrophysics, 677, A25. doi:10.1051/0004-6361/202345859.

Cite as: https://hdl.handle.net/21.11116/0000-000D-9031-8

Abstract

Spectropolarimetric reconstructions of the photospheric vector magnetic field are intrinsically limited by the 180$^\circ$-ambiguity in the orientation of the transverse component. So far, the removal of such an ambiguity has required assumptions about the properties of the photospheric field, which makes disambiguation methods model-dependent. The basic idea is that the unambiguous line-of-sight component of the field measured from one vantage point will generally have a non-zero projection on the ambiguous transverse component measured by the second telescope, thereby determining the ``true'' orientation of the transverse field. Such an idea was developed and implemented in the Stereoscopic Disambiguation Method (SDM), which was recently tested using numerical simulations. In this work we present a first application of the SDM to data obtained by the High Resolution Telescope (HRT) onboard Solar Orbiter during the March 2022 campaign, when the angle with Earth was 27 degrees. The method is successfully applied to remove the ambiguity in the transverse component of the vector magnetogram solely using observations (from HRT and from the Helioseismic and Magnetic Imager), for the first time. The SDM is proven to provide observation-only disambiguated vector magnetograms that are spatially homogeneous and consistent. A discussion about the sources of error that may limit the accuracy of the method, and of the strategies to remove them in future applications, is also presented.