Prediction of temperature changes until 2040 caused by solar activity

Predictions of solar activity variations and related climate changes until 2040 are presented in the work. The Wolf numbers are used as a solar activi ty index, and the climate changes are characterized by the deviations of th e global surface temperatures from its average value. The regression relati onship, connecting global temperatures averaged over ten years to Wolf numb ers, is used in the prediction. This relationship was obtained within the s cope of the mechanism of the solar activity influence on climate proposed b y the authors. According to this mechanism, galactic cosmic rays modulated by solar activity variations change the aerosol concentration in the atmosp here, which, in turn, results in changes in the radiation balance and tempe rature regime on the Earth's surface. The solar activity predictions indica te that the minimum of the next solar cycle 24 will be in 2007 and will coi ncide with the secular minimum. It is predicted that, during this period, t he temperature will decrease by -0.5 degreesC relative to its average value . Then, the temperature will rise and will reach the normal value in 2040. The presented calculations indicated that the temperature decrease caused b y solar activity can compensate the greenhouse effect.