it's very active in other ways, too!
ALERT: Geomagnetic K-index of 8 (G4)
Space Weather Message Code: ALTK08
Serial Number: 18
Issue Time: 2015 Mar 17 1401 UTC
ALERT: Geomagnetic K-index of 8
Threshold Reached: 2015 Mar 17 1358 UTC
Synoptic Period: 1200-1500 UTC
Active Warning: Yes
NOAA Scale: G4 - Severe
NOAA Space Weather Scale descriptions can be found at http://www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude.
Currents - Possible widespread voltage control problems and some
protective systems may mistakenly trip out key assets from the power
grid. Induced pipeline currents intensify.
Spacecraft - Systems
may experience surface charging; increased drag on low earth orbit
satellites, and tracking and orientation problems may occur.
Navigation - Satellite navigation (GPS) degraded or inoperable for hours.
Radio - HF (high frequency) radio propagation sporadic or blacked out.
Aurora - Aurora may be seen as low as Alabama and northern California.
72 de Larry W2LJ
QRP - When you care to send the very least!