Which system is most likely to be affected...

Question 1 of 29218jy5GpbKc6ySpZR3yX0Md

Which system is most likely to be affected by atmospheric disturbances?

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Question 1 of 29218

Q

Which system is most likely to be affected by atmospheric disturbances?

🔍 Key Concepts

• Propagation characteristics of different frequency bands (VHF vs MF vs HF vs satellite) • How atmospheric conditions (ionosphere, solar activity, thunderstorms) affect radio waves • Which systems are satellite-based services versus terrestrial radio

💭 Think About

• Which option(s) use MF/HF frequencies that reflect from or pass through the ionosphere, instead of line-of-sight? • Which services here depend on satellites in geostationary orbit, and how are they typically shielded from lower-atmosphere disturbances? • Think about when you hear crackling or fading on the radio at sea—on which band does this usually happen most, especially at night or during storms?

✅ Before You Answer

• Identify which choice uses MF/HF bands for voice communications over long range • Separate satellite services (L-band, C-band) from conventional RF systems • Recall that ionospheric disturbances, solar flares, and thunderstorms primarily disrupt sky-wave and long-range HF propagation