Space Weather
Solar Flare Alert: An M7.4 flare peaked at 13h35 UT 17 Jan. An R2 radio blackout affected the HF bands across S America and S Atlantic regions.
This was the fifth M-class flare since 00h UT 17 Dec. The others were of XRay flux level M2 or below, on the NOAA scale. The scales can be seen here on the NOAA website:
https://www.swpc.noaa.gov/noaa-scales-explanation
[#]spaceweather
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