If you live near the Arctic Circle, get ready for Northern Lights. A solar wind stream is approaching Earth with wind speeds as high as 700 km/s. First contact with the fast-moving gas on Dec. 7th and 8th could produceG1-classgeomagnetic storms and auroras at high latitudes.
The source of this solar wind stream is a hole in the sun’s atmosphere, shown here in a Dec. 5th image from NASA’s Solar Dynamics Observatory:This is a “coronal hole”–a region where the sun’s magnetic field has opened up, allowing solar wind to escape. Because this hole is broad, the emerging stream of s:olar wind is broad as well. It should influence Earth for several days after it arrives.