Reconstruction of the insolation conditions of the past by the growth rings of the trees

The dependence of the structure of the growth rings of Pinus pallasiana Lamb. from the total solar radiation was ascertained. The equations of regression, which make it possible to restore the values of the annual sum of solar radiation in the past, when instrumental actinometrical observation was not executed, on the basis of measurement of the width of growth rings, are proposed. The graph of the insolation regime of the Southern coast of the Crimea since 1912 is given (measurement of radiation is fulfilled her since 1956)