Summary: We have confirmed the solar origin of insolation cycles of 11,500, 4400,
3950, 2770, 2500, 2090, 1960, 1670, 1460, 1280, 1195, 1145, 1034, 935,
835, 750 and 610 yrs found in speleothem luminescence by their presence
in other indices of the solar wind. The 11,500-yr solar cycle can produce
climatic variations similar to those caused by the orbital variations.
We discovered a sub-annual cycle of 27 days in one very high-resolution
speleothem proxy paleoclimatic record, attributed to solar rotation,
which causes the periodic appearance of active zones on the visible
solar surface, which are the major emitters of solar wind. Solar wind
modulates cosmic ray flux at the Earth, while cosmic rays influence
the atmospheric transparency, thus producing a multiplication of solar
variations in insolation. Small variations of the solar activity can
produce a measurable influence on insolation.
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