Still Waters Posted March 24, 2017 #1 Share Posted March 24, 2017 For 15 days starting on March 7, 2017, NASA's Solar Dynamics Observatory, or SDO, returned visible light images of a yolk-like spotless sun. This is the longest stretch of spotlessness since the last solar minimum in April 2010, indicating the solar cycle is marching on toward the next minimum, which scientists predict will occur between 2019-2020. The sun goes through a natural 11-year cycle marked by two extremes: solar maximum and solar minimum. Sunspots are dark regions of complex magnetic activity on the sun's surface, so the number of sunspots at any given time is used as an index for solar activity. http://www.spacedaily.com/reports/NASAs_SDO_sees_a_stretch_of_spotless_Sun_999.html Link to comment Share on other sites More sharing options...
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