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
Commenti
Posta un commento