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Table 2

Solar radius observations in arcsec (′′) at one astronomical unit (AU).

Instrument, site, authors Years Solar radius [] λ [nm]

Solar Astrolabe, Calern (Fr), Laclare et al. (1999) 1975–1998 959.51 ± 0.01 * 540.0
SDM, Boulder (US), Brown & Christensen-Dalsgaard (1998) 1981–1987 959.65 ± 0.01 ** 800.0
SDS, Balloon experiment (mean value), Sofia et al. (2013) 1992–2011 959.76 ± 0.01 615.0
DORAYSOL, Calern (Fr), Morand et al. (2010) 1999–2006 959.48 ± 0.01 * 548.0
SoHO-MDI, in space (Transit of Mercury), Emilio et al. (2012) 2003, 2006 960.12 ± 0.09 676.78
Picard-SODISM, in space (Transit of Venus), Meftah et al. (2014a) 2012 959.86 ± 0.20 607.1
SDO-HMI, in space (Transit of Venus), Hauchecorne et al. (2014) 2012 959.90 ± 0.06 617.3

Notes.

(*)

Solar Astrolabe and DORAYSOL data were corrected for atmospheric refraction and for zenith distance, but not for turbulence.

(**)

Corrected data to one astronomical unit.

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