The following intro does not relate to measurement data.

I have since some years the physical impression the direct solar irradiation on the skin stinges more than ever(Austria).

This may have several reasons, for instance even a change in my sensitivity by ageing etc.

The impression is not linked to air temperature according to my experience.

In order to cross-check this with measurements, I wondered where I might get direct solar irradiation data as 1) a spectral analysis as 2) a time series including the very recent years as well as for time intervals such as decades ago.

So spectral data on direct normal irradiance (DNI), that is.

I could not find that at the NASA, Copernicus websites.

Background of my question:

I, a physicist, am personally extremely worried - as many are, of course - about climate change - since 2001 but increasingly since 2023.

Since the air composition has changed what regards the aerosol concentration and thus only reduced condensation nuclei are available, cloud cover is reduced and thus the direct irradiation becomes more intense. So far, so clear.

But I wonder if reduced aerosols are the 'entire story' since the situation with the regeneration (or even deterioration) of the ozone layer might as well be of influence, since the ozone depletion is all other that stopped to my knowing ever since the CFC & Co ban. That means that there might be a shift in the spectrum of direct radiation reaching the earth surface by a change in atmosphere composition.

At the end - what makes the direct irradiation so much more "stingy" in recent years?