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Solar cycle
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==== Cycle 24 ==== {{Main|Solar cycle 24}} Solar cycle 24 began on 4 January 2008,<ref>{{Cite press release | author1= Bernhard Fleck | date= 14 January 2008 |url=http://www.esa.int/Our_Activities/Space_Science/SOHO_the_new_solar_cycle_starts_with_a_bang |title=SOHO: the new solar cycle starts with a 'bang' |work=European Space Agency |access-date=2017-05-11 |language=en-GB}}</ref> with minimal activity until early 2010.<ref>{{Cite news |title=Solar Cycle 24 begins |date=2008-01-10 |author=Tony Phillips |url=https://science.nasa.gov/science-news/science-at-nasa/2008/10jan_solarcycle24/ |work=NASA |access-date=2010-05-29 |archive-date=2021-02-28 |archive-url=https://web.archive.org/web/20210228054909/https://science.nasa.gov/science-news/science-at-nasa/2008/10jan_solarcycle24/ }}</ref><ref>{{Cite news |title=As the Sun Awakens, NASA Keeps a Wary Eye on Space Weather |date=2010-06-04 |author=Tony Phillips |url=https://science.nasa.gov/science-news/science-at-nasa/2010/04jun_swef/ |work=NASA |access-date=2013-05-18 |archive-date=2021-03-20 |archive-url=https://web.archive.org/web/20210320221857/https://science.nasa.gov/science-news/science-at-nasa/2010/04jun_swef }}</ref> The cycle featured a "double-peaked" [[solar maximum]]. The first peak reached 99 in 2011 and the second in early 2014 at 101.<ref>{{cite web |title=Solar Cycle Progression |website=NOAA / NWS Space Weather Prediction Center |url=http://www.swpc.noaa.gov/products/solar-cycle-progression |access-date=2015-07-06}}</ref> Cycle 24 ended in December 2019 after 11.0 years.<ref name="Hello 25" />
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