NEWS AND NOTES INCREASING SOLAR RADIATION CA N CHANGE CLIMATE Since the late 1970s, the amount of tergovernmenta l Panel on Climat e Change reports to solar radiation during times of little sunspot activity has increased have occurred over the past 100 years," he says. by nearly 0.05% per decade, ac- cording to a NASA-funded study. The solar cycle has a period o f approximately 11 years, "Thi s trend is important be- cause, if sustained over many de- during which the Sun under- goes a period of increased cades, it could cause significant cli- mat e change," says Richard magnetic and sunspot activity called the "solar maximum," Willson , a researcher affiliated with NASA's Goddard Institute for followed by a quiet period called the "solar minimum." Spac e Studies and Columbia University's Earth Institute. He is Althoug h the inferred in- crease of solar irradiance in the lead author of the study re- This image from the Solar and Heliospheric cently published in Geophysical the 24 years o f satellite obser- Observatory (SOHO) extreme ultraviolet vations is about 0.1%—not Research Letters. imaging telescope shows large magneti- "Historical records of solar ac- enough to cause notable cli- cally active
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Jun 1, 2003
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