The map above was generated using G7RAU’s Live MUF application. The map uses Great Circle (azimuthal) projection centred roughly on Central Europe. The page is automatically refreshed approximately once per minute. Actual contacts can take place via the long or the short path around the world, but the map will always show only the short path between stations, despite some lines appearing to wrap around the globe.
The data source for this map is PSK Reporter. This is an automated reception reporting system reporting on WSPR, FT8, FT4, MSK144 and some other digital modes. Transmitters tend to be very low power (<5W or even only a few mW) but transmissions are worldwide. Reports are plotted for all HF amateur bands.
Solar flares can often cause intense bursts of X-rays to be blasted towards Earth. When they strike the atmosphere the ionosphere becomes highly ionized, which can cause severe radio blackouts due to noise on the HF frequencies. Blackouts can also affect VHF, UHF and higher frequencies by creating high levels of noise.
Contact paths remain visible on the map for 10 minutes before being erased.
*The path plots are reliant on the correct locations existing in various databases for the tens of thousands of radio operators. These are not always correct and errors do occur, so don’t be surprised by the odd few crazy dx lines appearing on the maps!