Extra exam question E3B09
Subelement E3, RADIO WAVE PROPAGATION· Group E3B
E3B09
At what time of year is sporadic-E propagation most likely to occur?
- A.Around the solstices, especially the summer solstice (correct answer)
- B.Around the solstices, especially the winter solstice
- C.Around the equinoxes, especially the spring equinox
- D.Around the equinoxes, especially the fall equinox
WhySporadic-E propagation is most likely to occur around the solstices, especially the summer solstice. Sporadic-E propagation is most common around the solstices, and especially pronounced around the summer solstice, when the small, intensely ionized patches of E-region ionization that produce this mode form most readily, answer A. The winter solstice and either equinox don't show the same seasonal peak in sporadic-E activity.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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