LONG-TERM CHANGES OF THE SURFACE AIR-TEMPERATURE IN RELATION TO SOLARINERTIAL MOTION

The inertial motion of the Sun around the barycentre, or centre of mas s, of the Solar System has been employed as the base in searching for possible influence of the Solar System as a whole on climatic processe s, especially on the changes in surface air temperature. A basic cycle of about 180-200 years and its higher harmonics up to 30 years have b een found in surface air temperature of central Europe since 1753, est ablished from 13 continuous instrumental time series. These periods co rrespond to the periods of solar inertial motion. In the first half of the 19th century, when the solar motion was chaotic, this temperature was about 0.75 degrees C lower than that in the 20th (1940-50) and th e 18th (1760-70) centuries. The mentioned decades of long-term tempera ture maxima coincide with the central decades of the ordered (trefoil) motion of the Sun. The temperatures in coastal Europe have been found to have slightly different properties, especially on a long-time scal e. The periods of 35-45 years are significantly pronounced in the coas tal Europe temperature spectrum. The chaotic motion of the Sun in the next decades could decrease both the solar forcing and global surface air temperature.