GEOMAGNETIC STORM WATCH: A large canyon-shaped hole in the sun's atmosphere is facing Earth and spewing a stream of solar wind toward our planet. Estimated time of arrival: 2 to 3 days from now. This has prompted NOAA forecasters to issue a geomagnetic storm watch for March 28th when storm levels could reach category G2--that is, moderately strong. Auroras could descend from the Arctic Circle to northern-tier US states from New York to Wisconsin to Washington. Visit Spaceweather.com to learn more about the incoming solar wind stream and what makes it so potent
Above: This canyon-shaped coronal hole (CH) is a magnetic fissure in the sun's atmosphere where solar wind can escape and flow towards Earth. The underlying image, taken on March 25th, comes from extreme UV telescopes on board NASA's Solar Dynamics Observatory.
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