Amateur Extra Class: 2020–2024
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E3C15:

What might be indicated by a sudden rise in radio background noise across a large portion of the HF spectrum?

  1. A temperature inversion has occurred
  2. A solar flare has occurred
  3. Increased transequatorial propagation is likely
  4. Long-path propagation is likely
E3C01 E3C02 E3C03 E3C04 E3C05 E3C06 E3C07 E3C08 E3C09 E3C10 E3C11 E3C12 E3C13 E3C14 E3C15