Northern Lights Now – SWPC has posted a G2 storm watch for potential aurora on September 11 with follow-on activity on Sept 12 that may reach G1 storm levels. The image below shows the periods of time to expect the strongest activity. The Red areas should have G2 storming while the orange areas are predicted to have G1 storming.
This activity is the result of high speed wind from the second of a pair of coronal holes providing a 1-2 punch. Solar wind speeds reached speeds of 515km/s in the first stream, but the magnetic structure was not favorable to northern lights activity. The second stream, which is already buffeting Earth with wind speeds over 550 km/s is oriented more favorably. Boulder has already registered three periods of G1 storming.