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) http://xoomer.virgilio.it/iovane/xtrieste.htm 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. i8iov > > Il 4 agosto 2017 alle 16.22 Tom Van Baak <t...@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
