SFI = Solar Flux Index, SN = Sunspot Numbers and K = Planetary K Index (updates every 3 hrs),
SW = Solar Wind. For VHF conditions, "Band Closed" means no Sporadic E reported.

Propagation Basics:

SFI needs to be > 105, SN > 70 & Sig Noise < S3 for decent propagation on the most popular DX bands.
K of 0-2 = Quiet Band Conditions, K = 3-4 is Unsettled, K = 5-9 is Minor to Extreme Geomagnetic Storm,
(K values equal to or greater than 5 can prevent reliable skywave HF communications and SW > 500
km/s can result in poor HF conditions even when all other metrics indicate good conditions.)

For an in-depth discussion of the chart above, go Here

Propagation Deep Dive: After Clicking Buttons Below, Press the CTRL AND F5 keys at the same time to force update of the data.