With the solar flux index remaining relatively high over the past week, the F2 MUF has been spending most of the day in the mid 40MHz region. For 6m operators, it's always a good sign to see the MUF climb this high as it only takes a nudge to keep it climbing, hopefully to reach that magical 50MHz level.
The region between 10m and 6m is chalk-full of commercial two-way FM activity, particularly from 39MHz on up. With the skip zone running east-west, oftentimes the distinctive Boston accent or the unmistakable Bronx chatter can be heard...police, taxis, fire departments...sometimes even with sirens blazing away in the background. Other times, things will be further south, with accents favoring easily-recognized southern drawls.
Early this morning at 0641Z, a small M1.8 flare added some extra fuel to the F2 fire, resulting in an unusually early-morning rise in the MUF.
By 0900 local time, it was hovering around 46-47MHz when I started to hear the 22-watt W4CLM beacon near Atlanta, Georgia. Warming-up the transmitter and calling a few CQ's on 50.098, I was soon answered by Bob, N3LL, in EL86 on the west coast of Florida ....a nice single-hop (2600mile) F2 QSO. Another CQ brought KJ4E in EL98, to the northeast of Bob.
From here, things went south fast and for some reason, the normally slow climb halted as the MUF quickly retreated to the low 40MHz regions...it was all over.
The end of the opening can be clearly seen in the geomagnetic activity recorded at the Kiruna Magnetometer (Sweden). The circled area indicates the period of high MUF:
...but what started the sudden spike in the MUF today...was it the earlier flare or the suddenly south-going 'Bz' component of the Interplanetary Magnetic Field as seen about an hour earlier?
I wonder what surprises tomorrow will bring?