Space Weather Message Code: ALTK04 Serial Number: 1845 Issue Time: 2015 Dec 31 0105 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2015 Dec 31 0105 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily…