A night to remember

On the night of Jan 19 - 20, the strongest aurora I’ve seen so far lit up the sky in vivid green, pink, and violet. Driven by an X1.9 solar flare and an Earth-directed CME, geomagnetic activity surged beyond Kp 8,67 (G4 on NOAA’s scale) and the main show peaked between 21:45 and 23:30. With a new-moon darkness and clear, cold air, the green curtains were even visible to the naked eye - and I ended…