These figures do not change the predictions on this site.
Only the effective sunspot number reaches the propagation engine — it is
the one input ITU-R P.533 takes. Every prediction here assumes quiet
geomagnetic conditions, so during a storm they read optimistic.
The interpretations are rules of thumb, not predictions.
For an actual circuit at an actual time, use the
path planner or the
reach map.
Solar flux appears twice because NOAA measures it at
Penticton and KC2G derives it from ionosondes. When they disagree, that
disagreement is itself information.
Fetched by our own service once an hour, so your browser never contacts
NOAA or KC2G. Sources: NOAA SWPC (public domain) and
prop.kc2g.com by Andrew Rodland, KC2G.
Alert text is reproduced verbatim.