New paper: solar magnetic variation initiates interglacials

“Using the fact that the galactic cosmic ray flux incident on the heliosphere boundary is known to have remained close to constant over the last 200 kyr, and that there exist independent records of geomagnetic variations over this period, Sharma25 was able to use a functional relation reflecting the existing data to give a good estimate of solar activity over this 200 kyr period.  …

Sharma was able to calculate the normalized solar modulation factor over the last 200 kyr. The result is shown in Fig. 8.

The 100 kyr periodicity is readily apparent in Fig. 8. It is also seen that the d18O record and solar modulation are coherent and in phase. Sharma concludes from this that “. . . variations in solar surface magnetic activity cause changes in the Earth’s climate on a 100-ka timescale”.  …


It has been shown above that low altitude cloud cover closely follows cosmic ray flux; that the galactic cosmic ray flux has the periodicities of the glacial/interglacial cycles; that a decrease in galactic cosmic ray flux was coincident with Termination II [the warming that initiated the Eemian, the last interglacial] ; and that the most likely initiator for Termination II was a consequent decrease in Earth’s albedo.

The temperature of past interglacials was higher than today most likely as a consequence of a lower global albedo due to a decrease in galactic cosmic ray flux reaching the Earth’s atmosphere. In addition, the galactic cosmic ray intensity exhibits a 100 kyr periodicity over the last 200 kyr that is in phase with the glacial terminations of this period. Carbon dioxide appears to play a very limited role in setting interglacial temperature.”  “INTERGLACIALS, MILANKOVITCH CYCLES, AND CARBON DIOXIDE”  h/t Niche Modeling


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