ALERT: Geomagnetic K-index of 8

Space Weather Message Code: ALTK08 Serial Number: 22 Issue Time: 2015 Jun 23 0514 UTC

ALERT: Geomagnetic K-index of 8 Threshold Reached: 2015 Jun 23 0513 UTC Synoptic Period UTC

Active Warning: Yes NOAA Scale: G4 - Severe NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/NOAAscales

Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude. Induced 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.