via the ARRL: The ARRL Solar Update

Solar activity reached high levels this past week when Region 4299
produced an M1.1 (R1/Minor) flare on December 6. Shortly after, the
region produced an M8.1/2b (R3/Strong) flare, also on December 6.
Associated with the M8.1 flare was a 1,100 SFU Tenflare, a 1,143
km/s Type II sweep and a Type IV sweep. (A “sweep” is a solar radio
burst that sweeps through the RF spectrum as the energy moves
outward…

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