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Description of the files containing the Level 2 spectra for Aosta Saint-Christophe, Italy (available at https://doi.org/10.5281/zenodo.4028907)
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The provided dataset is the Level 2 homogenized, corrected for the instrument individual characteristics, and re-evaluated high quality record of spectra of the global solar irradiance in the range 290 - 500 nm for Aosta Saint-Christophe, Italy for the period 24 July 2006 - 8 July 2019. Each file contains all available spectra for one day of the year. The spectra have been measured by the double monochromator Bentham DTMc300 spectroradiometer with serial number 5541. The slit function resulting from the setup of the monochromator is approximately triangular with a spectral resolution (FWHM) of 0.54 nm. More details regarding the file format are provided below.

Usage of the provided dataset is free. However, before data usage the PI contact information can be found in each file) of the station should be contacted. 

The spectra for each year are compressed in zip files. The naming convention of the zip files is:
SSS_YYYY_III_LX.zip

SSS: Three letter acronym of the station. For the particular dataset it is always AAO (Observatory of ARPA Valle d'Aosta)
YYYY: The year in which the spectra have been recorded (4 digits)
III: Αbbreviation of the type of the instrument (for Bentham we used BNT)
X: Processing level of the spectra
 
File name format:
SSS_YYYY_DDD_LX.csv

SSS: Three letter acronym of the station. For the particular dataset it is always AAO (Observatory of ARPA Valle d'Aosta)
YYYY: The year in which the spectra have been recorded (4 digits)
DDD: The Day Of Year (DOY) in which the spectra have been recorded
X: Processing level of the spectra

File content:
Row 1: General information regarding the measureemnts
Row 2: General information regarding the time of the measurements
Row 3: File creation time and contact person for data usage.
Row 4: Data headers for the columns in the following lines
Rows 5 - end: Spectra if available. Each row contains one spectra and the necessary information

Columns in rows 5 - end are:
Column 1: year
Column 2: Day of the year
Column 3: Exact time of the measurement at 290 nm (minute of the day in UTC)* 
Column 4: Exact time of the measurement at 400 nm (minute of the day in UTC)* 
Column 5: Exact time of the measurement at 500 nm (minute of the day in UTC)* 
Columns 6 - 846: Irradiance (in Watt/m^2/nm) at wavelengths 290 - 500 nm respectively with a step of 0.25 nm

*Spectral scans begin at 290 nm and usually end at 500 nm. However, scans may also end at 400 nm. In order to provide the user information regarding the duration of each spectral scan we provide the time at the three particular wavelengths.

MISSING VALUES: Missing values have been filled using "NaN"
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Description of the file containing the daily noon UV index for Aosta Saint-Christophe, Italy (available at https://doi.org/10.5281/zenodo.4028907)
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File name: aao_noon_uvi_l2.csv

The noon UV index for each day has been calculated as the average of available measurements for ±15 minutes around the exact local noon (minimum SZA) from the Level 2 spectral dataset. The file contains the following three columns:

Column 1: Year
Column 2: Day of Year
Column 3: noon UV index

MISSING VALUES: Missing values have been filled using "NaN"
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