Space Weather Message Code: ALTK04
Serial Number: 1503
Issue Time: 2011 Apr 06 1059 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2011 Apr 06 1058 UTC
Synoptic Period: 0300-0600 UTC
Station: Boulder
Active Warning: Yes
Space Weather Message Code: WARSUD
Serial Number: 79
Issue Time: 2011 Apr 06 0926 UTC
WARNING: Geomagnetic Sudden Impulse expected
Valid From: 2011 Apr 06 0940 UTC
Valid To: 2011 Apr 06 1045 UTC
IP Shock Passage Observed: 2011 Apr 06 0853 UTC
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