Question
Where is transequatorial propagation (TEP) most likely to occur?
Answer Options
- A) Between points separated by 2,000 miles to 3,000 miles over a path perpendicular to the geomagnetic equator
- 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
Correct Answer: A
Explanation
Transequatorial Propagation (TEP) is a sporadic, high-band propagation mode occurring between two stations located roughly equidistant from the magnetic equator in opposite hemispheres (e.g., North America and South America). This mode relies on reflections or scatter from irregularities that form along the geomagnetic equator in the F2 ionospheric layer.
TEP is most likely to occur between points separated by 2,000 miles to 3,000 miles over a path perpendicular to the geomagnetic equator. The signal path essentially travels North-South (or South-North) and crosses the magnetic equator roughly at the path midpoint, benefiting from the strong, highly ionized layers that form there, especially during evening hours.
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