A Surprise Geomagnetic Storm
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On April 20, 2020, space weather watchers were caught by surprise by the first geomagnetic storm of the year, which caused bright aurora observed over Canada and some northern US states. Shown above are real-time solar wind data from ACE showing a maximum BZ of about -15nT. Similar real-time data were recorded by NOAA's DSCOVR Satellite (please see https://www.swpc.noaa.gov/products/real-time-solar-wind).
This item was contributed by Richard Mewaldt of Caltech. Address questions and comments to
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Last modified 21 April 2020.