Basic Qualification · B-007 Radio wave propagation · B-007-002-010
During the day, what two sub-regions appear in the ionosphere?
- A D1 and D2
- B E1 and E2
- C B1 and B2
- D F1 and F2
Correct answer: D — F1 and F2. From the official ISED question bank, verified word for word.
Why
During the day, strong solar radiation splits the upper F region of the ionosphere into two distinct layers called F1 and F2. The full explanation — and one for every question — is in Pro.
Practise this section
How signals travel: the ionosphere and its layers, skip, ground wave, sporadic E, and which bands work when.