[Latinmag] [Fwd: [Gpmag-l] Project on observatory calibrations againat a quantum standard]

[Rubén Somoza]

---------------------------- Mensaje original ----------------------------
Asunto: [Gpmag-l] Project on observatory calibrations againat a quantum
standard
De:     "Thomson, Alan W.P." <awpt en bgs.ac.uk>
Fecha:  Mar, 26 de Febrero de 2013, 8:20
Para:   "worldobs en geolab.nrcan.gc.ca" <worldobs en geolab.nrcan.gc.ca>
        "gpmag-l en mailman.ucsd.edu" <gpmag-l en mailman.ucsd.edu>
Cc:     "V.Ya.Shifrin" <V.Ya.Shifrin en vniim.ru>
        "nobuhisa.kaneko en aist.go.jp" <nobuhisa.kaneko en aist.go.jp>
--------------------------------------------------------------------------

Dear Colleagues,

I have been informed by Dr Nobu-hisa Kaneko, the chair of the Technical
Committee on Electricity and Magnetism (TCEM), of the Asia-Pacific
Metrology Program (APMP), of an opportunity for institutes operating
geomagnetic observatories to participate in an international calibration
project designed to compare observatory standard instruments against a
quantum standard magnetometer.

Here are some remarks by Dr Kaneko, which explains things further:

"Several national metrology institutes (NMIs) in the Asia-Pacific and
around the world have established independent standards of magnetic flux
density (MFD) traceable to their respective realizations of SI units.
These NMIs are signatories to the CIPM Mutual Recognition Arrangement
(MRA) and their calibration and measurement capabilities (CMCs), approved
and published in the BIPM Key Comparison Database in accordance with the
CIPM MRA, are recognized throughout the global measurement and conformance
infrastructure.

However, the main source of precise data on the magnetic field of the
planet is the global network of geomagnetic observatories (GMOs).
Measurements of Earth level MFD performed at most geomagnetic
observatories are presently not traceable to NMIs and are outside of the
global measurement and conformance infrastructure.

This comparison is open to NMIs with an independent realization and to
geomagnetic observatories (with high level MFD measurement capabilities).
The latter must be designated by NMIs of the respective country for the
participation in this comparison. A geomagnetic observatory can
participate in the comparison on its own or jointly with an NMI, if the
NMI has a sufficient experience and competence in the field of absolute
measurements of the Earth magnetic field flux density.

The comparison will result in the evidence needed to support existing and
improved CMCs and will link participant GMOs to internationally recognized
standards and pave the way to acceptance of their measurements in CIPM and
ILAC MRAs.

The measurement scheme assumes the use of transportable quantum standard
magnetometer (transfer standard) sent unattended and calibrated by the
pilot laboratory at the beginning, in the middle and after the comparison
to monitor its stability."


If you are interested in participating in this project please contact Dr
Kaneko directly at
nobuhisa.kaneko en aist.go.jp<mailto:nobuhisa.kaneko en aist.go.jp>  for further
details. Technical details can be obtained from Prof. Vladlen Ya. Shifrin
(V.Ya.Shifrin en vniim.ru<mailto:V.Ya.Shifrin en vniim.ru>).

The comparison is registered in the International Key Comparison Data Base
(KCDB) on the website of the International Bureau of Weights and Measures
(BIPM):
http://kcdb.bipm.org/appendixB/KCDB_ApB_print_result.asp?cmp_idy=1275&cmp_cod=APMP.EM-S14&search=&cmp_cod_search=&page=&met_idy=&bra_idy=&epo_idy=&cmt_idy=&ett_idy_org=&cou_cod
and
http://kcdb.bipm.org/appendixB/KCDB_ApB_info.asp?cmp_idy=1275&cmp_cod=APMP%2EEM%2DS14&search=&cmp_cod_search=&page=&met_idy=&bra_idy=&epo_idy=&cmt_idy=&ett_idy_org=&cou_cod=
and is due to start in March, 2013.

See also www.apmpweb.org<http://www.apmpweb.org> and
http://www.bipm.org/en/cipm-mra/ for some background material.

IAGA Division 5 will consider the implications of this outcomes of this
project when it is completed in 2014.

Best Regards,
Alan Thomson
Geomagnetism Team, British Geological Survey
(Chair, Division 5, IAGA)




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Rubén Somoza
Dpto. Ciencias Geológicas, FCEyN, UBA
Ciudad Universitaria, Pabellón 2
C1428EHA, Buenos Aires, Argentina
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