On 10/22/19 1:13 AM, Poul-Henning Kamp wrote:
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In message
<CADXevOaQ6a7eUoKciAttXhr5=w5y6xxybojfqmrb42x2qpl...@mail.gmail.com>, Fiorenzo
Cattaneo writes:
Any kind of atmospheric disturbance has a measurable effect on GPS
space and time precision, [...]
Actually, it's even simpler than that:
Any electrical charge in the freshnell-zone between the two antennas
delays the signal.
In practice that means "any ion ..."
Rain clouds harbour significant ionization, long before they become
thunderstorms.
That's still a pretty small effect for RF propagation at L-band
and here's a paper discussing just such effects
https://iopscience.iop.org/article/10.1088/1742-6596/1112/1/012021/pdf
what happens here is that charge in a large thunderstorm affects the ion
density in the ionosphere.
However, I don't think that's "cloudy day vs sunny day"
Apart from that, the lower atmosphere is pretty predictable with
respect to ionization.
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