Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..835l&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, Vol. 57, No. 8, p. 835 - 845
Physics
58
Solar Activity Cycles: History, Solar Activity Cycles: Earth, Solar-Terrestrial Relations
Scientific paper
Solar data have been used as parameters in a great number of studies concerning variations of the physical conditions in the Earth's upper atmosphere. The varying solar activity is distinctly represented by the 11-yr cycle in the number of sunspots. The length of this sunspot period is not fixed. Actually, it varies with a period of 80-90 yr. This variation has previously been found to be strongly correlated with long-term variations in the global temperature. Information about Northern Hemisphere temperature based on proxy data is available back to the second half of the sixteenth century. Systematic monitoring of solar data did not take place prior to 1750. Therefore, a critical assessment of existing and proxy solar data prior to 1750 is reported and tables of epochs of sunspot minima as well as sunspot cycle lengths covering the interval 1500-1990 are presented. The tabulated cycle lengths are compared with reconstructed and instrumental temperature series through four centuries. The correlation between solar activity and Northern Hemisphere land surface temperature is confirmed.
Friis-Christensen Eigil
Lassen Knud
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