SORCE’s Solar Spectral Surprise – UV declined, TSI constant

SORCE’s Solar Spectral Surprise – UV declined, TSI constant. Could it be that measurements of Solar UV and Irradiance show enough variability to be a factor in climate trends? Anthony Watts wants you to think so. There’s a NASA news report about the SORCE spacecraft’s Solar Irradiance Monitor (SIM) results that can be spun that way, so he pastes it in.


Decrease in Solar ultraviolet radiation, 2004 - 2007. Source: Joanna Haigh/Imperial College London

Too bad that:

  1. The unexpected UV decline may be an artifact of the instrumentation.

    “I strongly suspect the SIM trends are instrumental, not solar,” said Lean, noting that instrumental drift has been present in every instrument that has tracked ultraviolet wavelengths to date.

  2. If the change is real the impact would be the opposite of the observed climate trends.

    “If these SIM measurements indicate real solar variations, then it would mean you could expect a warmer surface during periods of low solar activity, the opposite of what climate models currently assume,” said Gavin Schmidt, a climate modeling specialist at NASA’s Goddard Institute for Space Studies in New York City.

Still, NASA scientists are simultaneously assessing the accuracy of the measurements and considering what this apparent information might suggest for solar models. The rigid mainstream scientific consensus strikes again?

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