Solar activity cycles and climate of the Northern Hemisphere of the Earth

The possibility of a connection between long-term variations in the Earth's climate and solar cycles is investigated using: (a) six solar activity reconstructions and (b) eight paleoreconstructions of the Northern Hemisphere temperature. It wasfound that the Earth's Northern Hemisphere temperature exhibits significant variations with periods of 86 and 190 years, close to the periods of the corresponding solar cycles of Gleissberg (century-scale variation) and Suess (bicentennial variation) . However, no significant correlation was found between secular and bicentennial periodicities in climate and solar activity. Possible reasons for the weakness of the solar-climatic correlation are discussed.