↑ The Solar Flux Today

By Doron Tal, 4X4XM

Solar flux (SFI) today is Loading solar flux data... (solar flux units).
Source: NOAA Space Waether Prediction Center

High SFI correlate with good HF propagation conditions.
ConditionsBADLowAverageGoodBetterBest
MUF< 15 MHz> 21 MHz> 24 MHz> 28 MHz> 50 MHz
SFI6783102124148172196219240273

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.


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