Aurora alert! A high-speed solar wind stream is about to create polar geomagnetic storms on Sunday, March 29th.
The source of the stream is a coronal hole on the sun:
Coronal holes are places in the sun’s atmosphere where the magnetic field opens up and allows solar wind to escape. In the extreme UV image, above, curved lines trace the sun’s magnetic field; arrows indicate the flow of gaseous material (solar wind) out of the deep-purple coronal hole.
Gas velocities in the stream could be as high as 700 km/s (1.6 million mph). When such a high-speed stream hits Earth, it is likely to spark bright polar auroras. Stay tuned for weekend lights.
Here first pictures of auroras: