[time-nuts] Fwd: [hpsdr] SDR experiment for the solar eclipse

iovane at inwind.it iovane at inwind.it
Fri Aug 4 18:59:31 EDT 2017

there is no reason for an eclipse to affect time. However, working on the 1999 data made available by the German group, I had found a periodicity in the noise in one of the time series. In particular, a pattern (a peak) was repeated every 35 minutes, which was the periodicity recorded by a gravimeter in Trieste (Italy)
I discarded those data because they didn't match in time the Trieste's disturbances.
I suspect that an eclipse-related cause might affect in some way the atomic clock circuitry (or even magnetic shielding) with a (weak)  possibility of causing artifacts.

Keep an open eye.


>     Il 4 agosto 2017 alle 16.22 Tom Van Baak <tvb at LeapSecond.com> ha scritto:
>         > > 
> >         We were originally going to put a 5071A-locked beacon on three ham
> >         bands, but decided WWV and CHU would be better sources, and logistics
> >         were turning into a problem: I'm going to be doing my wideband recording
> >         from a cottage in northern Michigan. But I'm still a time-nut, so the
> >         receiver will be GPSDO-controlled, and there will be a stratum 1 NTP
> >         server in the cottage to provide timestamps. :-)
> > 
> >         John
> > 
> >     > 
>     Hi John,
>     My favorite write-up about atomic clocks and eclipses (a null result) is at:
>     http://www2.mpq.mpg.de/~haensch/oldStuff/eclipse/eclipse.html
>     There you will find a good summary, thorough methodology, and many plots for the 1999 eclipse. Plus they posted all the raw data (H-maser, cesium, rubidium), a time-nuts dream. There is no model for why an eclipse should affect time at the atomic (quantum) level so a null result is fine. If nothing else, it sets an upper bound on measurement precision or a lower bound on clock anomalies, if they exist.
>     Much more dramatic is what an eclipse might do to the ionosphere, as this may affect both GPS and HF radio. So I'm very please to see the ham community milking this rare opportunity for all it's worth.
>     /tvb
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