[time-nuts] IEEE Spectrum - Dec 2017 - article on chip-scale atomic frequency reference

Dana Whitlow k8yumdoober at gmail.com
Sun Dec 10 07:59:24 EST 2017


Check    https://en.wikipedia.org/wiki/Earth_tide

According to that, a foot of motion is easily plausible.

The Wiki article says that displacements around a meter in the solid
crust can be seen over the right intervals.  This must wreak havoc in
VLBI geodesy work, except that for some in the field this would be the
"signal" and most everything else the noise.

Dana


On Sat, Dec 9, 2017 at 7:42 PM, Tom Holmes <tholmes at woh.rr.com> wrote:

> Mark...
> You're place really moved a foot in 48 hours? Impressive and scary!
>
> From Tom Holmes, N8ZM
>
> > On Dec 9, 2017, at 8:19 PM, Mark Sims <holrum at hotmail.com> wrote:
> >
> > Which gets real fun with things like solid earth tides getting
> involved.   Lady Heather can now calculate and plot solid earth tides.
>  Over the last 48 hours my place moved up/down 315 mm and gravity changed
> 186  microgals... and that was a rather stable period.
> >
> > ------------------
> >
> >> A 1 meter change in elevation corresponds to a frequency offset of
> about 1e-16. So for 1e-18 levels of performance you "only" need to know g,
> or your elevation to 1 cm accuracy.
> > <tides.gif>
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