Extra exam question E3B01
Subelement E3, RADIO WAVE PROPAGATION· Group E3B
Where is transequatorial propagation (TEP) most likely to occur?
- A.Between points separated by 2,000 miles to 3,000 miles over a path perpendicular to the geomagnetic equator (correct answer)
- B.Between points located 1,500 miles to 2,000 miles apart on the geomagnetic equator
- C.Between points located at each other’s antipode
- D.Through the region where the terminator crosses the geographic equator
WhyTransequatorial propagation is most likely on paths roughly perpendicular to the geomagnetic equator, connecting stations 2,000 to 3,000 miles apart. Transequatorial propagation happens on paths roughly perpendicular to the geomagnetic equator, connecting stations on opposite sides of it that are typically 2,000 to 3,000 miles apart, a geometry tied to how ionization is enhanced along the geomagnetic equator itself, answer A. It isn't defined by a shorter along-the-equator path, doesn't require antipodal stations, and has nothing to do with the day/night terminator crossing the geographic equator.
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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