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Saturday Morning Ham Radio HF Live Stream with AF0F 2026-05-09 14:45 UTC
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374 views16likes1:14:26HeartlandHamRadioOriginal Release: 2026-05-10

Solar activity significantly impacts HF radio propagation through atmospheric layers, with key indices including SFI (Solar Flux Index) measuring solar radiation levels affecting higher bands like 10m, 15m, and 20m; K-index indicating short-term geomagnetic disturbances from solar flares or coronal mass ejections; and A-index measuring 24-hour geomagnetic activity. Higher SFI values improve propagation on higher bands, while lower K and A indices reduce atmospheric noise. During peak solar cycles, SFI can exceed 200, dramatically improving long-distance communication capabilities.

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