Physics
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sci...244..197l&link_type=abstract
Science (ISSN 0036-8075), vol. 244, April 14, 1989, p. 197-200.
Physics
56
Irradiance, Solar Activity, Solar Cycles, Solar Spectra, Ultraviolet Spectra, Climate, Earth Radiation Budget, Lyman Alpha Radiation, Satellite Observation, Solar Maximum Mission, Solar Terrestrial Interactions
Scientific paper
The sun's total irradiance decreased from 1980 to mid-1985, remained approximately constant until mid-1987, and has recently begun to increase. This time interval covered the decrease in solar activity from the maximum of solar cycle 21 to solar minimum and the onset of cycle 22. The sun's ultraviolet irradiance also decreased during the descending phase of cycle 21 and, like the total irradiance, is now increasing concurrently with the increase in cycle 22 activity. Although only 1 percent of the sun's energy is emitted at ultraviolet wavelengths between 200 and 300 nanometers, the decrease in this radiation from July 1, 1981 to June 30, 1985 accounted for 19 percent of the decrease in the total irradiance over the same period.
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