The Solar Flux Today
Today the solar flux index (SFI) is Loading solar flux data... (solar flux units; where 1 sfu=10-22 Watts per meter² per Hz).
Data relayed from NOAA Space Waether Prediction Center
| SFI (sfu) | 67 | 83 | 102 | 124 | 148 | 172 | 196 | 219 | 240 | 273 | |
| Conditions | BAD | Low | Average | Good | Better | Best | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| MUF (MHz) | <12 | <15 | > 21 | > 24 | > 28 | > 50 | |||||
| SSN | 0 | 25 | 50 | 75 | 100 | 125 | 150 | 175 | 200 | 250 | |
Solar flux (SFI) represents the level of solar activity. Higher solar flux increases ionization in the ionosphere, enhancing HF radio propagation and enabling long-distance communication for ham radio operators. However, it can also lead to increased radio noise and potential disruptions. Monitoring solar flux as well as other propagation indices is essential for optimizing communication strategies and maintaining reliable connections. The project Understanding HF Propagation provides a detailed overview and tutorials covering this subject. In particular read there about the solar indices.