\label{irrallday}
(a) Solar spectral irradiance recorded with the spectrometer (black curve) and calculated with the TUV model (gray curve) at 13:00 using O${_3}$ data from OMI/KNMI/NASA. (b) Solar UV irradiance integrated from 280nm to 400nm, derived from the spectrometer measurements (diamond black) and from the TUV model calculations (gray pentagon) along a clear sky day on October 7$^{th}$, 2013 in La Plata city.