Solar radius determined from PICARD/SODISM observations and extremely weak wavelength dependence in the visible and the near-infrared

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Volume 616 (August 2018)

A&A, 616 (2018) A64

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Table 2.

Summary of the PICARD solar radius observations at several wavelengths.

(nm)	(nm)	Radius at 1 au^a	STD (arcsec)	[arcsec]	(km)	Experiment	References
393.37	0.7	961.360 arcsec	0.106	0.387	697 244 281^b	SODISM II	This work

535.7	0.5	959.777 arcsec	0.125	0.194	696 096 141^b	SODISM II	Meftah et al. (2014a)
607.1	0.7	959.862 arcsec	0.126	0.185	696 157 134^b	SODISM II	Meftah et al. (2014a)
782.2	1.6	959.876 arcsec	0.099	0.129	696 168 94^b	SODISM II	Meftah et al. (2014a)
1025.0	6.4	959.832 arcsec	0.181	0.105	696 136 76^b	SODISM II	Meftah et al. (2014a)
535.7	0.5	959.83 arcsec	0.15	0.36	261	SODISM	This work
607.1	0.7	959.86 arcsec	0.06	0.20	696 156 145	SODISM	Meftah et al. (2014c)
782.2	1.6	959.91 arcsec	0.19	0.34	247	SODISM	This work

Notes. STD represents the standard deviation of the median value (). represents the combined standard uncertainty of the individual standard uncertainties (based on the uncertainty budget). corresponds to the bandwidth of the central wavelength () of the filter.

^(a)

The solar radius is based on the determination of the inflection point position.

^(b)

The PICARD/SODISM II results are obtained from an estimate of the Fried parameter (). The PICARD/SODISM II combined uncertainties () may be undervalued compared to those of SODISM, who are overestimated (center detections and PICARD/SODISM on-board timing).

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