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venerdì 17 marzo 2017


BIG CORONAL HOLE TURNS TOWARD EARTH: A hole has opened in the sun's atmosphere, and it is turning toward Earth. NASA's Solar Dynamics Observatory is tracking the opening, which researchers call a "coronal hole" (CH):
Coronal holes are places--big places--where the sun's magnetic field opens up and allows solar wind to escape.  A wide stream of solar wind flowing from this coronal hole is expected to reach our planet on March 23rd.  The impact of the solar wind should produce magnetic activity around Earth's poles and could spark the first auroras of northern spring. Stay tuned. Free: Aurora Alerts

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