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Science 26 September 1997:
Vol. 277. no. 5334, pp. 1963 - 1965
DOI: 10.1126/science.277.5334.1963
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Reports

Total Solar Irradiance Trend During Solar Cycles 21 and 22 

Richard C. Willson

Results from Active Cavity Radiometer Irradiance Monitor (ACRIM) experiments show an upward trend in total solar irradiance of 0.036 percent per decade between the minima of solar cycles 21 and 22. The trend follows the increasing solar activity of recent decades and, if sustained, could raise global temperatures. Trends of total solar irradiance near this rate have been implicated as causal factors in climate change on century to millennial time scales.

Center for Climate Systems Research, Columbia University, 2845 Windfall Avenue, Altadena, CA 91001, USA. E-mail: acrim{at}primenet.com

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