Northern Lights Now – A second G1 geomagnetic storm watch for the week is posted for Wednesday offering the possibility of KP=5 or more. The increase in aurora borealis activity is expected as the high speed solar wind arrives from the northern extension of a southern pole coronal hole. Wind speed from the coronal hole approached 600km/s as it passed the STEREO-Ahead satellite, and it appears to have extended slightly northwards since the pass. It is possible wind speeds could reach 660 km/s at Earth by Wednesday. Here’s an image of the coronal hole when it was directed towards Earth:
The current forecast from SWPC calls for a 6 hour period of potential KP=5+ starting around 3:00PM GMT. Here is NLN’s AuroraCast inforgraphic of the expected Max KP’s
As always – these watches have a +/- of about 6 hours, and about a 50% accuracy, so hope for the best and plan for the worst.