SFI: Solar Flux Index in the 2800 MHz band. For W6ELProp users.
SN: Sunspot Number. Not to be used in VOACAP and W6ELProp.
A: "Ap" geomagnetic perturbation index (from 0 to 400). Values Ap>48 are indicative of geomagnetic storm.
K: "Kp" geomagnetic perturbation index (from 0 to 9). Values Kp>5 are indicative of geomagnetic storm.
X-Ray: Ionizing radiation density flux in the X-Ray band. Values of "M" and "X" are indicative of important solar eruptions which may cause absorption in the HF band.
304A: Solar radiation index in the extreme UV range, spectral line of 304 Angstroms (Helium). If this index presents an ascending trend, it may be indicative of good propagation conditions in the higher HF bands (10m-30m) during the coming days.
Ptn Flx, Elc Flx: Protons and electrons flux in the energetic range between 35 and 1900 MeV. High values are indicative of solar radiation storms.
Aurora: Auroral activity index (from 0 to 9), correlated with the Kp index. High values are indicative of a higher probability of aurorae present at lower latitudes.
Bz: Module of the magnetic field component perpendicular to the North Pole. Negative values cause a more easy entry of the solar wind in the ionosphere at high latitudes.
SW: Solar wind speed, km/s.
HF conditions: extrapolation of the propagation conditions in the HF band using the compiled data.
VHF conditions: probabilities of auroral propagation in the VHF band. The chart shows the lower latitude where aurorae are expected to occur.
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