↑ What is the difference between the Greyline and the Solar Terminator?

By Doron Tal, 4X4XM

The "terminator" and "greyline" separate the daylight and dark sides of a planetary body, but their definitions differ. The terminator is a line tangent to the parent star, while the grayline is the twilight zone.

Why is radio propagation better along the greyline?
Propagation is ehanced along the "greyline" because there is no absorbing D-layer there. Read a reasoned explanation.

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