Level 2 spectra of the global solar irradiance in the wavelength range 290 - 500 nm measured at Aosta - Saint Christophe, Italy by the Bentham DTMc300 with serial number 5541 in 2006 - 2019

The provided dataset includes the Level 2 spectral measurements (in Watt/m²/nm) of the solar irradiance in the range 290 - 500 nm, performed by the Bentham DTMc300 spectroradiometer with serial number 5541. The particular instrument performs automated continuous, high quality  measurements at Aosta - Saint Christophe, Italy (45.7° N, 7.4° E, 570 m a.s.l.) since 2006. The Level 2 spectra are re-evaluated and homogenized and are currently available for the period 24 July 2006 - 8 July 2019. Each file contains the spectra for one day. The time (in UTC) for the measurements at 290, 400, and 500 nm is also provided for each spectral scan so that the user has also information for the duration of each scan.

The daily noon UV index is also provided for the same period in the file "aao_noon_uvi_l2.dat". Erythemal doses have been calculated by weighting each spectrum with the CIE (1999) effective spectrum, and then integrating in the range 290 - 400 nm. Then the UV index has been calculated by dividing erythemal dose (in mWatt/m²) by 25. The noon UV index for each day has been calculated as the average of available measurements for ±15 minutes around the exact local noon.

For further information for file format and contents please see the readme.txt file.

Reference

CIE: CIE S007/E-1998 Erythema reference action spectrum and standard erythema dose, Color Research & Application, 24, 158-158, 10.1002/(sici)1520-6378(199904)24:2<158::aid-col11>3.0.co;2-4, 1999.