[time-nuts] Gamma-ray and jitter

Alan Melia alan.melia at btinternet.com
Sun Nov 14 00:30:49 UTC 2010


I am dubious of this but cant find a reference at the moment. Very little of
the massive doses of hard X-rays from the Sun actually reach the earths
surface. Most interact with the atmosphere to produce the ionisation layers.
Gamma have the same effect. If substantial Gammas were reaching the ground
evolution would be even more rapid :-))
see Wiki on cell damage from Gamma rays.

Alan G3NYK

----- Original Message ----- 
From: "Bob Camp" <lists at rtty.us>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Saturday, November 13, 2010 11:43 PM
Subject: Re: [time-nuts] Gamma-ray and jitter


> Hi
>
> As always - eliminating environmental influence from the results can be
challenging. Even with the parts in a vacuum chamber attached to a heated
block, there can still be things that directly relate to the building going
from day to night mode or from week day to week end mode.
>
> That said - yes there are periodic influences. Everything I've seen
appears to correlate to local time rather than sidereal time. I would admit
that it could be a function of back fitting.
>
> Bob
>
>
> On Nov 13, 2010, at 5:48 PM, iovane at inwind.it wrote:
>
> > In the very recent days it has been discovered a previously unknown
> > feature of our galaxy, that is the presence of two giant bubbles
> > which appear to be gamma-ray sources.
> >
> > See
> >
> > http://www.nasa.gov/mission_pages/GLAST/news/new-structure.html
> >
> > After reading this, I have revieved some old data of mine, which shoved
> > that the noise in a long term temperature measurement is higher when my
> > observing site is in view of that structure. Now I'm rather
> > convinced that there could be a correlation between my observations and
> > the above mentioned new findings, and I believe that the noise is
> > generated by the measuring setup in response to something
> > linked to the bubbles.
> >
> > Hence I'm wondering if that stimulus could also affect the jitter in
> > high performance oscillators.
> >
> > More precisely, I would ask time-nuts whether any sidereal periodicities
> > have ever been noticed in jitter measurements.
> >
> > Thanks,
> > Antonio I8IOV
> >
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