Question
What is a characteristic of VHF signals received via auroral backscatter?
Answer Options
- A) They are often received from 10,000 miles or more
- B) They are distorted and signal strength varies considerably
- C) They occur only during winter nighttime hours
- D) They are generally strongest when your antenna is aimed west
Correct Answer: B
Explanation
Auroral backscatter occurs when VHF signals are scattered by the rapidly moving, ionized gases associated with the aurora borealis (Northern Lights). When this happens, the received signals are characterized by severe, rapid, and often erratic fading and distortion, making voice communications difficult.
Therefore, the signals are typically distorted and signal strength varies considerably (auroral flutter). The propagation occurs when pointing your antenna generally north (towards the aurora), not west.
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