Reconstruction of total solar irradiance variability as simultaneously apparent from Solar Orbiter and Solar Dynamics Observatory

Publication date: 
Main author: 
Yeo, K. L.
IAA authors: 
Orozco Suárez, D.;del Toro Iniesta, J. C.;Balaguer Jiménez, M.;Bellot Rubio, L. R.;Moreno Vacas, A.;Strecker, H.
Yeo, K. L.;Krivova, N. A.;Solanki, S. K.;Hirzberger, J.;Orozco Suárez, D.;Albert, K.;Albelo Jorge, N.;Appourchaux, T.;Alvarez-Herrero, A.;Blanco Rodríguez, J.;Gandorfer, A.;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.;Feller, A.;Fernandez-Rico, G.;Fernández-Medina, A.;García Parejo, P.;Gasent Blesa, J. L.;Gizon, L.;Grauf, B.;Heerlein, K.;Korpi-Lagg, A.;Maue, T.;Meller, R.;Moreno Vacas, A.;Müller, R.;Nakai, E.;Schmidt, W.;Schou, J.;Sinjan, J.;Staub, J.;Strecker, H.;Torralbo, I.;Valori, G.
Astronomy and Astrophysics
Publication type: 
Solar irradiance variability has been monitored almost exclusively from the Earth's perspective. We present a method to combine the unprecedented observations of the photospheric magnetic field and continuum intensity from outside the Sun-Earth line, which is being recorded by the Polarimetric and Helioseismic Imager on board the Solar Orbiter mission (SO/PHI), with solar observations recorded from the Earth's perspective to examine the solar irradiance variability from both perspectives simultaneously. Taking SO/PHI magnetograms and continuum intensity images from the cruise phase of the Solar Orbiter mission and concurrent observations from the Helioseismic and Magnetic Imager onboard the Solar Dynamics Observatory (SDO/HMI) as input into the SATIRE-S model, we successfully reconstructed the total solar irradiance variability as apparent from both perspectives. In later stages of the SO mission, the orbital plane will tilt in such a way as to bring the spacecraft away from the ecliptic to heliographic latitudes of up to 33°. The current study sets the template for the reconstruction of solar irradiance variability as seen from outside the ecliptic from data that SO/PHI is expected to collect from such positions. Such a reconstruction will be beneficial to factoring inclination into how the brightness variations of the Sun compare to those of other cool stars, whose rotation axes are randomly inclined.
ADS Bibcode: 
Sun: activity;Sun: faculae;plages;Sun: magnetic fields;sunspots;Astrophysics - Solar and Stellar Astrophysics