General Class: 2019–2023
Help support WaveTalkers using Buy Me A Coffee!

G3A10:

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

  1. Long term oscillations in the upper atmosphere
  2. Cyclic variation in Earth's radiation belts
  3. The sun's rotation on its axis
  4. The position of the moon in its orbit
G3A01 G3A02 G3A03 G3A04 G3A05 G3A06 G3A07 G3A08 G3A09 G3A10 G3A11 G3A12 G3A13 G3A14