domenica 14 maggio 2017

A CORONAL HOLE TURNS TOWARD EARTH: A hole in the sun's atmosphere has opened, and it is directly facing Earth. NASA's Solar Dynamics Observatory photographed the structure on May 13th:
This is a coronal hole (CH)--a region where the sun's magnetic field opens up and allows solar wind to escape. The gaseous stream emerging from this hole is expected to reach Earth during the late hours of May 15th, possibly causing mild geomagnetic storms around the poles when it arrives. High-latitude sky watchers should be alert for auroras, especially in the southern hemisphere where deepening autumn darkness favors visibility. Free: Aurora Alerts

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