However, UV radiation output during a grand minimum could mean activity plummets by an additional 7 percent, the researchers wrote in the study. Solar radiation output typically drops during a normal solar minimum, though not enough to disrupt climate patterns on Earth. This similarity hints that another such event may be fast approaching, the researchers reported in the study.Īnd the scientists have estimated how intense such an event might be, by analyzing close to 20 years of data recording radiation output from stars that follow cycles similar to that of our sun. But a pattern of ever-decreasing sunspots over recent solar cycles resembles patterns from the past that preceded grand-minimum events. Sunspot activity was high in 2014 and has been dipping ever since, as the sun moves toward the low end of its 11-year cycle, known as the solar minimum, NASA reported in June 2017. This episode corresponded with a period of exceptional cold in parts of the world, which scientists have explained as being connected to the changes in solar activity. But during the late 17th century, the sun's spots all but disappeared.
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