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It's official: Solar Cycle 25 began December 2019 and will peak in 2025

September 15, 2020

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Solar minimum - the period when the sun is least active - is seen in this image from the Solar Ultraviolet Imager aboard NOAA's GOES-East satellite on Dec. 15, 2019. Scientists at NOAA and NASA have officially determined and announced (September 15, 2020) that we are now in Solar Cycle 25, which started in December 2019.

Don’t let the sunshine ruin your day. Check the UV Index first.

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solar radiation

Don't let this happen to you. Be sure to check NOAA's UV Index before going outdoors, and always protect your skin from harmful ultraviolet radiation with sunblock and sun-protective clothing.