>If in fact we are seeing any reduction over a span of a few years, then it would be extremely worrisome for life on the planet over the foreseeable future.
reduction of what? The sun is expected to become a red giant, i.e. to rather blow up first.
Well I really don't know much about the physics of the sun, and as said this fast change could be due to some fluctuation or a measurement error...it just came fastly into my mind that the
https://en.wikipedia.org/wiki/H-alpha line lies in that range 650-950nm and given that these
lines usually broaden due to the Dopplereffect and mostly experience a https://en.wikipedia.org/wiki/Redshift this might "bump" might be e.g. partially due to more recombinations of excessive hydrogen. I don't want to suggest that a phase of https://de.wikipedia.org/wiki/Schalenbrennen has been reached, but I am asking myself why there could rather suddenly so much more irradiance in this H-alpha line region. I mean if this is not a measurement error then what would be your first idea bout possible causes?