At what time of day is transequatorial propagation most likely to occur?
Morning
Noon
Afternoon or early evening✓Correct answer
Late at night
Explanation
The equatorial ionization anomaly is built up by daytime electric fields and reaches its strongest, most usable form after local noon, so transequatorial openings belong to the afternoon and early evening. In the morning the crests have not yet formed, and late at night recombination has dissolved them.