Propagation Center

Real-time solar forensics and band forecasting for W3BN Grid FN20.

W3BN Operations Bridge

Solar Indices

Solar Indices

D-Layer Absorption

D-Layer Map

Live Absorption Forecast

HF Propagation

HF Band Forecast

VHF/UHF Dynamics

VHF Conditions

Live MUF (MHz)

MUF Chart

Greyline & Solar Map

Greyline Map

Sunspot Visual

NASA Solar Disc

Grid FN20 Status: Monitor the MUF Chart for 10m/6m openings. High D-Layer Absorption indicates elevated signal loss on 40m/80m during daylight hours.

Official NOAA Data

Educational Briefing

Reference tutorial for decoding N0NBH indices. Jump to 01:50 for SFI explanation or 03:00 for K-Index stability notes.

Field Notes

  • SFI (Solar Flux)

    Measures solar radio noise. Values >150 indicate excellent F-layer ionization for the high bands.

  • K-Index

    Geomagnetic stability. Values under 4 are ideal; 5+ indicates a storm likely to degrade polar paths.

  • Night Propagation

    D-Layer absorption disappears at night, making 40m-160m prime for long-distance DX.