[esa-t474] Re: minutes of the T474 phone conference

[morozov at nusun.jinr.ru]

Dear all:
Some remarks about the earth field. The maximal field which can be
measured by our fluxgate magnetometer is 1 G and sensitivity is 0.0001 G
(I think the SLAC one has approximately the same parameters). It means
that there will not be the problems to measure the earth field and its
variation in time. The second important point is the background field in
the spectrometer region generated by technical equipment. Some questions
about it. What is it value and distribution in space? The variation on
time and uniformity of the variation?
My best regards, Nikolay.

> Hi All,
>
> I've put up minutes of today's T474 phone conference, with apoplogies
> for any mistakes or omissions. The internet connection for Skype from
> Poland was rubbish, so was difficult to follow everything.
>
> http://www.hep.ucl.ac.uk/~bino/T474/20061002.html
>
> Nikolay, I've cc'd you, i didn't know whether you're on the list, so
> my apologies if you get this mail twice.
>
> Below you can find a forwarded mail from Ray concerning stray field
> variations, which he asked me to forward.
>
> Cheers,
>      bino
>
>
>
> ---- Mail from Ray :-----------------------
>
> Bino,
>
> Here is the info I have on earth field variations.  Would you send it on
> to the T474 group.  I don't have such a list that you seem to use.
>
>     Facts:
>
>       Earth's field = 24,000 to 66,000 nT
>
>         1 Gauss = 1 Oersted = 100,000 nT
>         1 gamma = 1 nT
>
> Earths field has much variation mostly from sun activity.  See Figure 1
> at  http://www.ips.gov.au/Educational/3/1/2.
>
> There is a peak at frequencies of hundreds of seconds at about 100 gamma
> =
> 100 nT, which is probably too small for you to see on the flux gate.
> There are also variations of hundreds of nT over larger (minutes to
> hours)
> time scale that you may be able to see.
>
>    Check out:
>
> http://www.ips.gov.au/Educational/3/1
> http://nationalatlas.gov/articles/geology/a_geomag.html
> http://www.geomag.bgs.ac.uk/earthmag.html
> http://www.wdcb.ru/stp/cat1GEO.html
>
>
>     Ray
>
>
> Raymond G. Arnold                        arnold at slac.stanford.edu
> M.S. 42 SLAC                             voice (650) 926-2755
> P.O. Box 4349                            fax   (650) 926-2407
> Stanford, CA 94309
>
>
> ------------------------------------
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-- 
Николай Анатольевич Морозов
Лаборатория ядерных проблем
Объединенный институт ядерных
исследований
141980 Московская обл., г.Дубна
Тел. 496-21-62228
Факс 496-21-66666