The ACE Spacecraft is showing a sudden solar wind increase just before 19:00 UTC. The Boulder, Colorado ground based magnetometer detected a sudden geomagnetic impulse at 19:37 UTC. More to follow should a spike in geomagnetic activity be detected.
SUMMARY: Geomagnetic Sudden Impulse
Observed: 2012 May 21 1937 UTC
Deviation: 34 nT
Station: Boulder
The Boulder, Colorado ground based magnetometer is now showing a deviation.
