VHF/HF Propagation

VHF/HF Propagation:

Greyline course:

Solar data:

History of the last 30 days:

Abbreviations:

Greyline: Day-night boundary on Earth.

MUF: Maximum usable Frequency.

SN: Current sunspot number.

SFI: Solar Flux Index (radio flux index of the sun).

S-Noice: Signal-Noice (signal-to-noise ratio).