The Diurnal Temperature Range for Europe - a Search for Cosmic Ray   Forbush Decrease manifestations and the DTR periodicities
  Following on previous work by others, which gave evidence for few-day changes in the European Diurnal Temperature Range (DTR) apparently correlated with Cosmic Ray Forbush Decreases, we have made an independent study. We find no positive evidence. An analysis has also been made of the Fourier components of the time series of the DTR value (taken as deviations from a +/-10 day running mean). Evidence for a number of interesting periods is found, including one at about 27 days, albeit with a variability with time. The same period of solar irradiance (particularly in the UV) is favoured as the explanation. 
Anatoly D. Erlykin and Arnold W. Wolfendale
physics.ao-ph astro-ph.EP physics.geo-ph