3 ms·

So what does this mean?

• colanderman 9y ago
  The scale is explained here: http://www.swpc.noaa.gov/noaa-scales-explanation http://www.swpc.noaa.gov/noaa-scales-explanation (click on "Geomagnetic storms")
  • daenney 9y ago
    Ah, lovely. Thanks for the pointer!
• bb88 9y ago
  Lots of photographers shooting the aurora as it creeps down in latitude.