What type of propagation may allow a weak high frequency (HF) signal to be heard at a distance too far for ground-wave propagation but too near for normal sky-wave propagation?

Why

Scatter happens when HF signals bounce off small, irregular patches in the upper atmosphere, allowing them to reach distances that are too far for ground waves but too close for a normal sky-wave reflection. The full explanation — and one for every question — is in Pro.

Practise this section

Radio wave propagation is section B-007 of the Basic exam: How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.

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