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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The Shape of the Solar Limb: Models and Observations
Solar Physics, Volume 268, No. 1, Year 2011
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Description
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. © 2010 Springer Science+Business Media B.V.
Authors & Co-Authors
Thuillier, G.
France, Guyancourt
Laboratoire Atmosphères, Observations Spatiales
Claudel, J.
France, Guyancourt
Laboratoire Atmosphères, Observations Spatiales
Djafer, Djelloul
Algeria, Algiers
Centre de Recherche en Astronomie Astrophysique et Géophysique
Haberreiter, Margit
Switzerland, Davos Dorf
Pmod/wrc
United States, Boulder
University of Colorado Boulder
Mein, N.
France, Paris
L'observatoire de Paris
Melo, S. M.L.
Canada, Longueuil
Canadian Space Agency
Schmutz, Werner K.
Switzerland, Davos Dorf
Pmod/wrc
Shapiro, A.
Switzerland, Davos Dorf
Pmod/wrc
Short, C. I.
Canada, Halifax
Saint Mary's University
Sofia, S.
United States, New Haven
Yale University
Statistics
Citations: 27
Authors: 10
Affiliations: 8
Identifiers
Doi:
10.1007/s11207-010-9664-7
ISSN:
00380938
e-ISSN:
1573093X