:Product: Geophysical Alert Message wwv.txt
:Issued: 2022 Apr 25 0610 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
#
# Geophysical Alert Message
#
Solar-terrestrial indices for 24 April follow.
Solar flux 159 and estimated planetary A-index 5.
The estimated planetary K-index at 0600 UTC on 25 April was 1.
Space weather for the past 24 hours has been minor.
Radio blackouts reaching the R1 level occurred.
No space weather storms are predicted for the next 24 hours.
NOAA Alerts
Space Weather Message Code: ALTK04
Serial Number: 2291
Issue Time: 2022 Apr 24 0003 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2022 Apr 23 2359 UTC
Synoptic Period: 2100-0000 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 poleward of 65 degrees Geomagnetic Latitude.
Induced Currents – Weak power grid fluctuations can occur.
DOUBLE SOLAR FLARE: Sunspot AR2993 erupted twice in quick succession on April 25th, producing an overlapping pair of M1-class solar flares: movie. The double-blast caused a minor albeit long-lasting radio blackout over southeast Asia and Australia, affecting frequencies below 20 MHz. Stay tuned for updates about a possible CME.
