VE6AB Mobile Ops
The Grey Line...
All ham's who operate on HF, know about The "grey line," the band around the Earth that separates daylight from darkness.
Propagation along the grey line is very efficient. One major reason for this is that the D layer, which absorbs HF signals, disappears rapidly on the sunset side of the grey line, and it has not yet built upon the sunrise side.
ham radio operators can optimize long distance communications to various areas of the world by monitoring this band as it moves around the globe.
There is nothing that I like better, than hitting the backroads of southern Alberta, as the first hint of dawn breaks on the eastern horizon, while spinning the dial on my HF radio, and listening for DX on far horizons.
Throw my cameras in the mix, and I'm good to go...
