The correlation between the solar activity dynamics and season of the year with a frequency of brain attacks at men and women groups during 2009 in Barnaul was studied. In investigation the following analyses have been used: the correlation analysis allowing to establish a connection measure between the signs, the crosscorrelation analysis allowing to establish a connection measure between signs taking into account logs (the periods of a delay or an advancing of events by comparison of temporary ranks) and the cross-spectral analysis allowing to reveal strongly correlating frequency in temporary ranks, that is interference of oscillatory processes and their coherence (coordination of frequencies) on indicators of determination coefficients. For coefficient of coherence its value which isn›t belittling 0,44 units was considered as threshold value. It is shown that in the winter and in the summer the tendency to positive connection between compared processes, and in the spring and in the autumn inverse proportion is observed. Compared temporary ranks have the general rhythmic components: mostly the frequency synchronization of processes is expressed for the periods of 121,3; 45,5; 15,2; 7,4; 5,8; 4,5; 3,4 and 2,3 days. The periods of the brain attacks risk irrespectively from sex increases in summer, winter and especially autumn seasons of the year. Spring — is an optimum time.