caa a22 4500 445345608 CHVBK 20180317142827.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s11207-010-9664-7 doi (NATIONALLICENCE)springer-10.1007/s11207-010-9664-7 The Shape of the Solar Limb: Models and Observations [Elektronische Daten] [G. Thuillier, J. Claudel, D. Djafer, M. Haberreiter, N. Mein, S. Melo, W. Schmutz, A. Shapiro, C. Short, S. Sofia] In this paper we compare observed, empirical, and modelled solar limb profiles and discuss their potential use to derive physical properties of the solar atmosphere. The PHOENIX, SolMod3D, and COSI radiative transfer codes as well as VAL-C models are used to calculate the solar limb shape under different assumptions. The main properties of each model are shown. The predicted limb shape as a function of wavelength for different features on the solar disk, such as quiet Sun, sunspots, and faculae, is investigated. These models provide overall consistent limb shapes with some discrepancies that are discussed here in terms of differences in solar atmosphere models, opacities, and the algorithms used to derive the solar limb profile. Our analysis confirms that the most common property of all models is limb shapes that are much steeper than what is observed, or predicted by the available empirical models. Furthermore, we have investigated the role of the Fraunhofer lines within the spectral domain used for the solar limb measurements. Our results show that the presence of the Fraunhofer lines significantly displaces the limb inflection point from its position estimated assuming only the photospheric continuum. The PICARD satellite, launched on 15 June 2010, will provide measurements of the limb shape at several wavelengths. This work shows that the precision of these measurements allows for discrimination among the available models. Springer Science+Business Media B.V., 2010 Thuillier G. LATMOS-CNRS BP 3, 91371, Verrières le Buisson, France aut Claudel J. LATMOS-CNRS BP 3, 91371, Verrières le Buisson, France aut Djafer D. Observatory of Tamanrasset, CRAAG, BP 32, 11000, Tamanrasset, Algeria aut Haberreiter M. Observatorium, PMOD-WRC, Dorf Strasse 33, 7260, Davos Dorf, Switzerland aut Mein N. Observatoire de Paris - Meudon, Meudon, France aut Melo S. Canadian Space Agency, 6767 route de l'aéroport, St Hubert, Québec, Canada aut Schmutz W. Observatorium, PMOD-WRC, Dorf Strasse 33, 7260, Davos Dorf, Switzerland aut Shapiro A. Observatorium, PMOD-WRC, Dorf Strasse 33, 7260, Davos Dorf, Switzerland aut Short C. St Mary's University, 923 Robie Street, Halifax, Nova Scotia, Canada aut Sofia S. Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT, USA aut Solar Physics Springer Netherlands 268/1(2011-01-01), 125-149 0038-0938 268:1<125 2011 268 11207 https://doi.org/10.1007/s11207-010-9664-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-010-9664-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Thuillier G. LATMOS-CNRS BP 3, 91371, Verrières le Buisson, France aut NATIONALLICENCE 700 1- Claudel J. LATMOS-CNRS BP 3, 91371, Verrières le Buisson, France aut NATIONALLICENCE 700 1- Djafer D. Observatory of Tamanrasset, CRAAG, BP 32, 11000, Tamanrasset, Algeria aut NATIONALLICENCE 700 1- Haberreiter M. Observatorium, PMOD-WRC, Dorf Strasse 33, 7260, Davos Dorf, Switzerland aut NATIONALLICENCE 700 1- Mein N. Observatoire de Paris - Meudon, Meudon, France aut NATIONALLICENCE 700 1- Melo S. Canadian Space Agency, 6767 route de l'aéroport, St Hubert, Québec, Canada aut NATIONALLICENCE 700 1- Schmutz W. Observatorium, PMOD-WRC, Dorf Strasse 33, 7260, Davos Dorf, Switzerland aut NATIONALLICENCE 700 1- Shapiro A. Observatorium, PMOD-WRC, Dorf Strasse 33, 7260, Davos Dorf, Switzerland aut NATIONALLICENCE 700 1- Short C. St Mary's University, 923 Robie Street, Halifax, Nova Scotia, Canada aut NATIONALLICENCE 700 1- Sofia S. Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 268/1(2011-01-01), 125-149 0038-0938 268:1<125 2011 268 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer