Which of the following types of propagation is most commonly associated with occasional strong signals on the 10-, 6-, and 2-meter bands from beyond the radio horizon?

Explicación

Sporadic E is intense, patchy ionisation in the E region that appears mainly in late spring and summer and can return signals on 10, 6 and 2 metres far beyond the radio horizon. It arrives suddenly and produces the strong short-lived openings typical of those bands.