Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.2063k&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 18, p. 2063-2074.
Physics
2
Scientific paper
In solar cycles 22-23, all solar indices showed maxima near 1990 and 2000 and minima in 1996. The maximum to minimum variation was only /~1-2% in the UV range 240-350nm. Dobson ozone intensities did not show any clear relationship with solar cycle and ozone variations were less than 10%. The UV-B (295-325nm) observed at ground by Brewer spectrophotometers at some locations had variations of /~50-100% for 295-300nm, and /~20-50% for 305-325nm. The maxima were in different years at different locations (even with separations of only ~300km), did not match with the solar cycle, and were far too large to be explained on the basis of ozone changes (1% decrease of ozone is expected to cause /~2% increase of UV-B). Thus, if the data are not bad, the UV-B changes do not match with solar activity or ozone changes and must be mostly due to other local effects (clouds, etc.?). When data are averaged over wide geographical regions, UV-B variation ranges are smaller (/~10-20%, probably because localised, highly varying cloud effects get filtered out), and are roughly as expected from ozone variations.
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