Some time back I recall discussion about a theory that the ionosphere was not behaving nowadays as it was, say, 50 years ago. I'm not talking here about sunspot cycle issues but whether or not there are factors at work that mean HF comms today is more difficult than many years ago due to ionospheric structural changes. I'm also ignoring things like increased noise floors due to SMPSUs, lights etc.
Can anyone point me in the direction of any definitive references to this theory?
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