Brazil still enjoys high daytime MUF. If we multiply the f0F2 MUF data
below by a factor 3 which gives us approximately the MUF(3000km) then we
get values greater than 20 MHz. The night-time MUF seems to drop very
low down to 2 MHz which is bad news for HF communication at that time.
73
Dieter, VK3FFB
https://www.ngdc.noaa.gov/stp/IONO/rt-iono/realtime/SAA0K_foF2.png
