During daytime, the F region commonly separates into?

  • AF1 and F2 layers
  • BD1 and D2 only
  • CE1 and E2 only
  • DTwo tropospheric layers
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Correct Answer: A. F1 and F2 layers
Explanation: Under daytime solar ionization, the F region is commonly described as F1 and F2; they tend to merge at night.
Reference: Standard antenna and wave propagation: ionospheric propagation