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WSM daytime pickup in Charleston

C

charlestondxman

I had a very interesting daytime pickup today, at about 4:30pm (sunset was 7:54pm). It was a cloudy day, and I was driving over the Ravenel Bridge headed into Charleston. I found music that sounded like country, and I knew pretty much the only station it could be was WSM. I also heard a WSM ID.

That was a 448 mile reception from downtown Charleston. I've picked them up around here in December and January daytime, but not with the higher April sun angle.
 
I've noticed unusual "daytime skip" openings on the AM band for years. They usually seen to occur around equinoxes, though I've heard them in the winter and even once in the summer.

I've heard WSM during the day several times in Detroit (nearly 500 miles), and heard WBZ (even further away) quite strong at 12:35 pm - solar noon!

Other times, I've heard a few graveyarders fighting it out during the day.

I have no idea what would cause this. "D failure", where, for some reason, the D layer loses its usual daytime ionization that absorbs low frequency RF? Undiscovered "C skip"?
 
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