STORM RECAP: As expected, a CME hit Earth’s magnetic field on Jan. 24th at approximately 1500 UT (10 am EST). The impact produced a G1-class geomagnetic storm and bright auroras around the Arctic Circle.
Even veteran aurora watchers were impressed. “This was one of the best displays that I’ve ever seen, and I mean ever in over 5000 hours on the ice,” says Andy Keen of Finland. “It was, in short, truly spectacular and something that will live with me for a lifetime.” In the Abisko National Park of Sweden, aurora tour guide Chad Blakely contributed a similar report: “Eight tourists and I were treated to one of the most wonderful displays I have ever seen. The auroras began as we were eating dinner and continued into the very early hours of the morning. Words can not describe the excitement we shared.”
SUBSIDING STORM: A geomagnetic storm caused by Monday’s M9-class solar flare and Tuesday’s CME impact is over. The aurora watch is cancelled for all but the higher latitudes around the Arctic Circle.
The geomagnetic field was quiet to major storm on January 24.
Solar wind speed ranged between 347 and 732 km/s. A strong solar wind shock was observed at SOHO at 14:34 UTC, the arrival of the CMEs observed early on January 23. The geomagnetic disturbance peaked 17-20h UTC when the planetary A index reached 80. The radiation storm peaked at the arrival of the CMEs with the above 10 MeV proton flux reaching a high of 6310 pfu, the strongest radiation event since 2003.