A first rapid synoptic magnetic field map using SDO/HMI and SO/PHI data

Context. Traditionally, the observation time needed to build synoptic maps of the solar magnetic field is bound to the 27 days of a full Carrington rotation due to the single viewpoint from Earth. Aims. Our aim is to reduce this observation time to 13.5 days by combining magnetograms from two vantag...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2024-01, Vol.681, p.A59
Main Authors: Loeschl, P., Valori, G., Hirzberger, J., Schou, J., Solanki, S. K., Orozco Suárez, D., Albert, K., Albelo Jorge, N., Appourchaux, T., Alvarez-Herrero, A., Blanco Rodríguez, J., Gandorfer, A., Germerott, D., Guerrero, L., Gutierrez-Marques, P., Kahil, F., Kolleck, M., del Toro Iniesta, J. C., Volkmer, R., Woch, J., Fiethe, B., Pérez-Grande, I., Sanchis Kilders, E., Balaguer Jiménez, M., Bellot Rubio, L. R., Calchetti, D., Carmona, M., Deutsch, W., Feller, A., Fernandez-Rico, G., Fernández-Medina, A., García Parejo, P., Gasent Blesa, J. L., Gizon, L., Grauf, B., Heerlein, K., Korpi-Lagg, A., Lange, T., López Jiménez, A., Maue, T., Meller, R., Moreno Vacas, A., Müller, R., Nakai, E., Schmidt, W., Schühle, U., Sinjan, J., Staub, J., Strecker, H., Torralbo, I.
Format: Article
Language:English
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Summary:Context. Traditionally, the observation time needed to build synoptic maps of the solar magnetic field is bound to the 27 days of a full Carrington rotation due to the single viewpoint from Earth. Aims. Our aim is to reduce this observation time to 13.5 days by combining magnetograms from two vantage points, 180° apart in longitude in the ideal case. Methods. We combined observations taken by the Polarimetric and Helioseismic Imager (SO/PHI) during the superior conjunction of the Solar Orbiter in February 2021 with data from the Helioseismic and Magnetic Imager (SDO/HMI) and constructed a synoptic map of the line-of-sight magnetic field of CR 2240. Resuls. The result is the first multi-view synoptic map using SDO/HMI and SO/PHI data from an observing period of only 16 days. Comparing the multi-view synoptic map to the standard synoptic map of SDO/HMI shows a significant amount of magnetic evolution between the dates on which the two instruments observed the same solar longitudes. The changed magnetic field was caught by the multi-view synoptic map but would have been missed by a standard synoptic map. Conclusions. Our results demonstrate that multi-view synoptic maps provide a new method to obtain a more instantaneous map of the magnetic field over the entire solar surface.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/202346046