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G3A10: What causes HF propagation conditions to vary periodically in a 26- to 28-day cycle?

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What causes HF propagation conditions to vary periodically in a 26- to 28-day cycle?

Answer choices for G3A10
Why this wins

The key fact is Rotation of the Sun’s surface layers around its axis. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

Direct answer summary (2023-2027 NCVEC pool)

The official correct answer for G3A10 is Rotation of the Sun’s surface layers around its axis.

The key fact is Rotation of the Sun’s surface layers around its axis. Match that fact to the exact condition in the question; the other choices describe a different rule, band, component, or operating situation.

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