Yeo, K. L.K. L.YeoKrivova, N. A.N. A.KrivovaSolanki, S. K.S. K.SolankiHirzberger, J.J.HirzbergerOrozco Suárez, D.D.Orozco SuárezAlbert, K.K.AlbertAlbelo Jorge, N.N.Albelo JorgeAppourchaux, T.T.AppourchauxAlvarez-Herrero, A.A.Alvarez-HerreroBlanco Rodríguez, J.J.Blanco RodríguezGandorfer, A.A.GandorferGutierrez-Marques, P.P.Gutierrez-MarquesKahil, F.F.KahilKolleck, M.M.KolleckToro Iniesta, J. C. delJ. C. delToro IniestaVolkmer, R.R.VolkmerWoch, J.J.WochFiethe, B.B.FiethePérez-Grande, I.I.Pérez-GrandeSanchis Kilders, E.E.Sanchis KildersBalaguer Jiménez, M.M.Balaguer JiménezBellot Rubio, L.R.L.R.Bellot RubioCalchetti, D.D.CalchettiCarmona, M.M.CarmonaFeller, A.A.FellerFernandez-Rico, G.G.Fernandez-RicoFernández-Medina, A.A.Fernández-MedinaGarcía Parejo, P.P.García ParejoGasent Blesa, J. L.J. L.Gasent BlesaGizon, L.L.GizonGrauf, B.B.GraufHeerlein, K.K.HeerleinKorpi-Lagg, A.A.Korpi-LaggMaue, ThorstenThorstenMaueMeller, R.R.MellerMoreno Vacas, A.A.Moreno VacasMüller, R.R.MüllerNakai, E.E.NakaiSchmidt, W.W.SchmidtSchou, J.J.SchouSinjan, J.J.SinjanStaub, J.J.StaubStrecker, H.H.StreckerTorralbo, I.I.TorralboValori, G.G.Valori2023-12-132023-12-132023https://publica.fraunhofer.de/handle/publica/45792910.1051/0004-6361/202345872Solar 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.ensun: activitysun: faculaeplagessun: magnetic fieldssunspotsjournal article