General Class: 2019–2023
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G3A01:

What is the significance of the sunspot number with regard to HF propagation?

  1. Higher sunspot numbers generally indicate a greater probability of good propagation at higher frequencies
  2. Lower sunspot numbers generally indicate greater probability of sporadic E propagation
  3. A zero sunspot number indicates that radio propagation is not possible on any band
  4. A zero sunspot number indicates undisturbed conditions
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