학술논문
Reconstruction of total solar irradiance variability as simultaneously apparent from Solar Orbiter and Solar Dynamics Observatory
Document Type
Working Paper
Author
Yeo, K. L.; Krivova, N. A.; Solanki, S. K.; Hirzberger, J.; Suárez, D. Orozco; Albert, K.; Jorge, N. Albelo; Appourchaux, T.; Alvarez-Herrero, A.; Rodríguez, J. Blanco; Gandorfer, A.; Gutierrez-Marques, P.; Kahil, F.; Kolleck, M.; Iniesta, J. C. del Toro; Volkmer, R.; Woch, J.; Fiethe, B.; Pérez-Grande, I.; Kilders, E. Sanchis; Jiménez, M. Balaguer; Rubio, L. R. Bellot; Calchetti, D.; Carmona, M.; Feller, A.; Fernandez-Rico, G.; Fernández-Medina, A.; Parejo, P. García; Blesa, J. L. Gasent; Gizon, L.; Grauf, B.; Heerlein, K.; Korpi-Lagg, A.; Maue, T.; Meller, R.; Vacas, A. Moreno; Müller, R.; Nakai, E.; Schmidt, W.; Schou, J.; Sinjan, J.; Staub, J.; Strecker, H.; Torralbo, I.; Valori, G.
Source
A&A 679, A25 (2023)
Subject
Language
Abstract
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 $33^{\circ}$. 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.