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G3A - Radio Wave Propagation
General Class
Sunspots and solar activity: 11-year cycle, solar flux, A and K indices, solar flares
0 questions
All G0A G0B G1A G1B G1C G1D G1E G2A G2B G2C G2D G2E G3A G3B G3C G4A G4B G4C G4D G4E G5A G5B G5C G6A G6B G7A G7B G7C G8A G8B G8C G9A G9B G9C G9D
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