Stoykova et al. 2008 Duhlata Cave, Bulgaria 243KYr Speleothem Luminescence Data Stoykova, D.A.; Shopov, Y.Y. Stoykova, D.A. Shopov, Y.Y. earth science/paleoclimate/speleothems (age,null,null,calendar year before present,null,speleothems,null,null,N,null) earth science/paleoclimate/speleothems (luminescence,calcium carbonate,null,dimensionless,null,speleothems,null,null,N,decimal logarithm relative units) earth science/paleoclimate/speleothems (Duhlata Cave>LATITUDE 42.483>LONGITUDE 23.183) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Stoykova, D.A. Investigator : Shopov, Y.Y. 2008-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6096 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/bulgaria/duhlata2008.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/bulgaria/duhlata2008.txt English https://www.ncdc.noaa.gov/paleo/study/6096 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/europe/bulgaria/duhlata2008.txt Stoykova, D.A.,Shopov, Y.Y. 2008. Origin of the climatic cycles from orbital to sub-annual scales. J. of Atmospheric and Solar-Terrestrial Physics, Vol. 70, pp. 293-302. START YEAR: -241500 AD * END YEAR: 2000 AD 23.183 42.483 23.183 42.483