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Solar UV variability is extremely relevant for the stratospheric ozone. Ithas an impact on Earth's atmospheric structure and dynamics through radiativeheating and ozone photochemistry. Our goal is to study the slope of the solarUV spectrum in two UV bands important for the stratospheric ozone production.In order to investigate the solar spectral variability, we use SOLSTICE (theSolar Stellar Irradiance Comparison Experiment) data onboard Solar Radiationand Climate Experiment (SORCE) satellite. Data sets used are far UV (115-180nm)and middle UV (180-310nm), as well as the Mg II index (the Bremen composite).We introduce the SOLSTICE [FUV - MUV] colour to study the solar spectralcharacteristics, as well as analysis of the colour versus Mg II index. Toisolate the 11-year scale variation, we used the Empirical Mode decomposition(EMD) on the data sets. The [FUV - MUV] colour strongly correlates with the MgII index. More in detail, the [FUV - MUV] colour shows a time dependentbehavior when plotted versus Mg II index. To explain this dependence wehypothesize an efficiency reduction of SOLSTICE FUV irradiance using anexponential aging law.

The dependence of the [FUV-MUV] colour on solar cycle