Physics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jastp..61...37r&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 61, Issue 1-2, p. 37-44.
Physics
13
Scientific paper
Solar radiation at wavelengths below 300 nm is almost completely absorbed by the Earth's atmosphere, becoming the dominant direct energy source and playing a major role in the chemistry and dynamics. Even small changes in this incoming radiation field will have both direct and indirect influences on atmospheric processes, and perhaps will affect the Earth's climate as well. Some of the very earliest space missions included devices to measure solar ultraviolet irradiance, but for the most part they lacked the necessary precision and accuracy to record true solar variability over long time periods. The technology has continued to improve, and today reliable measurements over time scales up to, and including, the 11-year solar cycle, are being obtained. This review provides a summary of measurements made during the most recent solar cycle (number 22 extending from 1986 1996), with emphasis on the spectral range 120-300 nm. Comparisons and validations of recent data sets are considered, together with an assessment of the present understanding of the solar variations. There is now general agreement that for solar cycle 22 the variation is as large as a factor of two at the shortest wavelengths, decreasing to roughly 10% near 200 nm. Proceeding to wavelengths above 200 nm the solar variability continues to decrease, and at about 300 nm it becomes smaller than the present measurement capability of about 1%.
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