space
ALERT: Geomagnetic K-index of 4
Space Weather Message Code: ALTK04 Serial Number: 2681 Issue Time: 2026 Aug 28 1502 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2026 Aug 28 1500 UTC Synoptic Period: 1500-1800 Active Warning: YES Comment: NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-…
Reported by NOAA SWPC
Read the complete report at NOAA SWPC ↗
Verification notice
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1 recorded state
Signal first indexedP4 · 98% quality · 1 source