Saturday, December 26, 2009

Cosmic Rays And Glacial Epochs

clipped from

In the graph below, the top panel shows several calculated cosmic ray flux reconstructions. In the bottom panel, that curve is flipped to represent the cooling effect. Notice that the cosmic ray flux coincides with the geologic reconstruction of ice ages. (The green “residual” curve represents the mathematical variance between models and observations.)

Cosmic flux and temp

Glacial epochs within ice ages seem to be controlled by the relationship of the earth to the sun. There are three main variations called Milankovitch cycles (after Serbian geophysicist Milutin Milankoviæ who first calculated the cycles): Orbital Eccentricity, Axial Obliquity, and Precession of the Equinoxes. All these cycles affect the amount and location of sunlight impinging on the earth. The following explanation of the cycles are summarized from The Resilient Earth:

Temp vs solar