Basic Qualification · B-007 Radio wave propagation · B-007-005-006
What effect of the sun's activity influences ionospheric propagation on a daily basis?
- A Coronal mass ejections (CME)
- B Electromagnetic and particle radiation
- C Solar wind
- D Infrared radiation
Correct answer: B — Electromagnetic and particle radiation. From the official ISED question bank, verified word for word.
Why
The sun constantly sends out electromagnetic waves and streams of charged particles that reach Earth every day, directly changing the ionosphere's ability to bounce radio signals. 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.