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RE: Schumann frequency - Variation

Here is a quote from a site which I didn't know about when writing about frequency change of the Schumann Resonance.


There are also +/-0.5 Hz variations in the center frequency, caused by a diurnal increase in ionization of the ionosphere as a result of radiation from the sun, having the effect of reducing the height of the ionosphere at 12 local time. Another factor which influences center frequency is sunspot activity.

The rest of the site is pretty interesting, too.
I might add that the suns output will grow over the next couple billion years. THIS should also have an effect on the Schumann resonance as well as rendering the Earth a barren desert before eventually getting swallowed up by the sun.
Too much is never enough

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