High solar activity will delay fade-in times. High geomagnetic activity can weaken or completely absorb signals to northern South America on low frequencies. For stations from Brazil, Argentina, and Uruguay which come in on the 120 bearing, solar flux needs to be under 100 and the lower the better, low solar activity is desirable and very low geomagnetic activity is essential. Even with all these factors in place there is no guarantee that propagation will actually happen. Seasonally Summer is best for North America and Winter for South America.
Equinoxes are the best for propagation to all areas.
The solar flux figure given after 0000 UTC covers the previous 24 hours up to that time. The solar activity and geomagnetic activity comments are the average for the preceding 24 hours. The last geomagnetic index number, the K index, summarises geomagnetic activity in the preceding 3 hours. An unusually weak signal for the current flux value indicates that low frequencies will be late fading in, whereas good, strong signal indicates signals will fade in early. As in fishing, you can never be completely certain of anything at a given moment.