[time-nuts] Rb-Thunderbolt test during a solar eclipse

[iovane at inwind.it]

azelio.boriani at screen.it wrote:
>Data: 03/09/2012 21.53

>Remember the man with two clocks: here we are in the same situation. We
>cannot tell which of the two is being screwed up or maybe both...

This is a different case. No matter what each clock does, what matters is the 
variation of the difference of rates, the variation, not the difference 
itself. 

>Interesting experiment but I think it would be better if a
>third clock was involved, for example a Cs reference.

A four-atomic-clock test including an Rb, two Cs and an H maser had been done 
at another eclipse with null result, but the clocks were at the same location. 
What is new with this test is that it involves a GPSDO and hence a virtual 
clock elsewhere. 

Antonio I8IOV

>
>On Mon, Sep 3, 2012 at 9:16 PM, iovane at inwind.it <iovane at inwind.it> wrote:
>
>> Dear time-nuts,
>> a friend of mine, Prof. Alexander Pugach (1), did an experiment on January
>> 15,
>> 2010, comparing a Rb standard to a GPSDO during a solar eclipse. The
>> experimenal site was Kiev, Ukraine.
>>
>> With reference to the attached graph, his text is (note: the red curve
>> belongs
>> to another test; the curve which matters here is the bold blue one):
>>
>> ****************************
>> Dear colleagues,
>> An experiment has been made aiming to investigate, how the “daily rate of
>> clock” varies during a solar eclipse on 01.15.2010.
>> In our observatory the high-precision rubidic standard (RbSt) of frequency
>> is
>> exploited. Its indications were compared to a basic frequency from highly
>> stable GPS receiver TRIMBLE Thunderbolt Е. The difference obtained is
>> noted as
>> “residue” and expressed in nanoseconds (ns).
>> This residue was conventially set equal to 0 ns at 00h 00m 13.01.2010. The
>> mean “daily rate of RbSt” equals  2740 ns/d, i.e.  3.17 10-11.  In the
>> Figure
>> this rate is shown with blue dashed line. What we have really registered is
>> shown with the bold blue curve.
>> The main minimum of this difference approximately coincided with the
>> eclipse
>> start on the Earth. The derivative on site А-В is approximately  6 times as
>> much as mean “daily rate of RbSt”.
>> ............
>> 19.02.2010
>> ****************************
>>
>> Apparently, the difference of rate of the two clocks varied by some 4000
>> ns, A
>> to B, in the 6 hours of duration of the eclipse (s to e = start to end of
>> eclipse at earth, T1-T4 =eclipse in Kiev).
>> I would ask you time-nuts, if such a variation could be simply due to an
>> occasional sum of "ordinary" adverse factors such as temperature,
>> holdover, sky
>> view, multipath, etc.., or it is really too large to be explained that way.
>> Sorry, I've no idea of what would be the worst case for any of the above
>> factors.
>>
>> Thanks,
>> Antonio I8IOV
>>
>> (1) Prof. Pugach is a senior astronomer at the Academy of Sciences of
>> Ukraine.
>>
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