Paper

Intensity contrast of solar network and faculae close to the solar limb, observed from two vantage points

D Orozco Suárez, A López Jiménez, Krivova, N A, Nakai, E, M Balaguer Jiménez, Meller, R, Alvarez-Herrero, A, Volkmer, R, P García Parejo, J Blanco Rodríguez, Strecker, H, Lange, T, Bellot Rubio, L R, Gasent Blesa, J L, Müller, R, Albert, K, Korpi-Lagg, A, Staub, J, Woch, J, Gutierrez-Marques, P, Calchetti, D, Schmidt, W, J C del Toro Iniesta, E Sanchis Kilders, Gandorfer, A, Jorge, N Albelo, Fiethe, B, Torralbo, I, Carmona, M, Fernández-Medina, A, A Moreno Vacas, Heerlein, K, Hirzberger, J, Schou, J, Sinjan, J, Appourchaux, T, Kahil, F, Grauf, B, Pérez-Grande, I, Maue, T, Fernandez-Rico, G, Feller, A, Kolleck, M, Gizon, L, Solanki, S K, Valori, G

2023

Overview

The brightness of faculae and network depends on the angle at which they are observed and the magnetic flux density. Close to the limb, assessment of this relationship has until now been hindered by the increasingly lower signal in magnetograms. This preliminary study aims at highlighting the potential of using simultaneous observations from different vantage points to better determine the properties of faculae close to the limb. We use data from the Solar Orbiter/Polarimetric and Helioseismic Imager (SO/PHI), and the Solar Dynamics Observatory/Helioseismic and Magnetic Imager (SDO/HMI), recorded at \\(60^\\) angular separation of their lines of sight at the Sun. We use continuum intensity observed close to the limb by SO/PHI and complement it with the co-observed \\(B_ LOS\\) from SDO/HMI, originating closer to disc centre (as seen by SDO/HMI), thus avoiding the degradation of the magnetic field signal near the limb. We derived the dependence of facular brightness in the continuum on disc position and magnetic flux density from the combined observations of SO/PHI and SDO/HMI. Compared with a single point of view, we were able to obtain contrast values reaching closer to the limb and to lower field strengths. We find the general dependence of the limb distance at which the contrast is maximum on the flux density to be at large in line with single viewpoint observations, in that the higher the flux density is, the closer the turning point lies to the limb. There is a tendency, however, for the maximum to be reached closer to the limb when determined from two vantage points. We note that due to the preliminary nature of this study, these results must be taken with caution. Our analysis shows that studies involving two viewpoints can significantly improve the detection of faculae near the solar limb and the determination of their brightness contrast relative to the quiet Sun.

• Publisher: Cornell University Library, arXiv.org
• Subject: Brightness / Faculae / Flux density / Line of sight / Magnetic flux / Solar activity / Solar limb / Solar observatories