Hi, Had another nice night last night but yet again no NLC visible from my location. However my cctv camera seems to have picked up another weak aurora. Faint green glow on northern horizon. Probably sub visual only picked up through the frame integration. Here's hoping we get some nice aurora over the coming months. cheers, Bill.
Around 0415 UTC on the 20th, a weak shock passed the ACE spacecraft. This shock was most likely associated with the CME from 17 July. Since the bulk of the CME passed ahead of earth, we only experienced unsettled (weak) geomagnetic activity levels.
In this plot of data from the ACE spacecraft, you can see the shock as a jump in the velocity (yellow line), temperature (green line), density (orange line), and in the magnetic field (white and red lines).
Hi Julius, Yes, that could be it. I monitor the NOAA space weather website and saw that there had been a little disturbance. It seems like such a long time ago now but in the 90's I visited Tromso (EISCAT) and saw some amazing aurorae from there. I'm hoping to make a return visit to the arctic north next year. cheers, Bill.