| Item | Element | Description |
| SFI | Solar Flux Index | DRAO Penticton no longer available, using NOAA data. Intensity of solar radiation measured at 2800MHz (10.7cm). Good indication of the F layer ionization (layer that gives us most of our DX on HF). The higher the number, the greater the level of ionization is, and the higher the frequency. Measured once daily. Note that NOAA recorded SFI for the day is the 2nd (or middle) of the DRAO readings. SFI does correlate to 304A (see graph below). |
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