PICARD SOL, a new ground-based facility for long-term solar radius measurements: first results

Eclipse on the Coral Sea: Cycle 24 Ascending

物理学;天文学

Meftah, M.^1 ; Corbard, T.^2 ; Irbah, A.^1 ; Morand, F.^2 ; Ikhlef, R.^2,3 ; Renaud, C.^2 ; Hauchecorne, A.^1 ; Assus, P.^2 ; Chauvineau, B.^2 ; Crepel, M.^1 ; Dalaudier, F.^1 ; Djafer, D.^4 ; Fodil, M.^3 ; Laclare, F.^2 ; Lesueur, P.^1 ; Lin, M.^1 ; Poiet, G.^1

Laboratoire Atmosphères, Milieux et Observations Spatiales, Université de Versailles Saint-Quentin-en-Yvelines, 78280 Guyancourt, France^1

Laboratoire Lagrange, UMR 7293, Observatoire de la Côte d'Azur, 06304 Nice, France^2

CRAAG, Observatoire d'Alger, Alger, Algeria^3

Unité de Recherche Appliquée en Energies Renouvelables, CDER, B.P. 88, Ghardaïa, Algeria^4

关键词: Atmospheric effects;    Atmospheric refractions;    Ground based measurement;    Ground components;    Narrow pass bands;    Near ultraviolet;    Scale calibration;    Space instrument;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/440/1/012003/pdf
DOI  :  10.1088/1742-6596/440/1/012003

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

PICARD SOL is the ground component of the PICARD mission and is operational since March 2011. A set of instruments including the replica of the space instrument and several atmospheric monitors was set up at Calern observatory in order to compare solar radius measured in space and on ground and to better understand and calibrate atmospheric effects on ground based measurements. SODISMII provides full disk images of the chromosphere and photosphere of the Sun in five narrow pass bands ranging from the near ultraviolet to the near infrared. Our preliminary results show a very good instrumental stability. After plate scale calibration using star doublet observations and corrections for atmospheric refraction, first estimates of the mean solar radius at the five wavelengths (393.37, 535.7, 607.1, 782.2, and 1025.0nm) are deduced from measurements recorded between May 2011 and December 2012.