Question
At what time of day is sporadic-E propagation most likely to occur?
Answer Options
- A) Between midnight and sunrise
- B) Between sunset and midnight
- C) Between sunset and sunrise
- D) Between sunrise and sunset
Correct Answer: D
Explanation
Sporadic-E (Es) propagation is a daytime-related phenomenon, although it can occasionally linger into the evening. The intense ionization that forms the dense, reflective patches in the E-layer is generally driven by solar radiation and the resulting atmospheric wind shear effects, which are strongest during the day. , Therefore, sporadic-E propagation is most likely to occur between sunrise and sunset. The peak occurrence often falls in the mid-morning and late afternoon to early evening hours of the summer, aligning with periods of strong solar heating and atmospheric instability.
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