000 WOXX10 KWNP 180126 SUMSUD Space Weather Message Code: SUMSUD Serial Number: 171 Issue Time: 2013 May 18 0121 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2013 May 18 0112 UTC Deviation: 31 nT Station: Boulder # Issued by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # Recent messages, data, and help at http://swpc.noaa.gov/alerts/ # Send questions to SWPC.Webmaster@noaa.gov