Original X1.7 flare report:
Issue Time: 2012 Jan 30 1653 UTC
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2012 Jan 30 1624 UTC
Deviation: 8 nT
2012-01-30 17:15 CME Arrival at Earth from the X1-solar flare
A pulse in the solar wind passed the ACE spacecraft around 1540 UTC (10:40 EST) today. This abrupt increase in speed and magnetic field strength is thought to be from a CME on Friday, January 27. No significant geomagnetic storm activity is expected from this. Another effect of Friday's eruption, a Solar Radiation Storm, continues its leisurely decay and is nearing the end of the event (currently at S1 (Minor) levels).