CHU on 3,330 kHz

I have been aware of the VOACAP propagation prediction software for many years and have wondered how accurate its results are. My casual observations have not been adequate for drawing any meaningful conclusions so for 10 nights this month I recorded the strength of the CHU carrier on 3,330 kHz. The results are shown here...

This is the result of averaging over all 10 nights...

As expected, the signal was strong during period between when the sun sets here on the west coast and when the sun rises in Ottawa. Most interestingly, the gradual rise in strength throughout the night agrees well with what VOACAP predicts for the path on the 80 m band. I don't know if this is what most people would call a sunrise enhancement.