For those of you who are interested in Space Weather and how it can affect radio propagation, I encourage you to visit the NOAA Space Weather Prediction Center
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Note the Hemispheric Power Index (HPI) in the above Aurora image … severe solar storms (high power) can significantly disrupt HF propagation. Values above 200 will be very disruptive. Updated every 30 minutes.
⊛ Maximum Usable Frequency Map - From kc2g.com / WorldWide Radio Operators Foundation ⊛
⊛ Global Propagation - Courtesy of the Australian Space Weather Agency ⊛
more intuitive T-Index Propagation animation map