Skip to main content

Quality control of Ebro magnetic observatory using momentary values

Abstract

Intercomparison of momentary values from observatories across Europe can be used as a test of reliability for a particular magnetic station in this area, as well as the whole network. The method presented by Voppel at the IAGA Assembly of Grenoble (1975) and developed by Schulz and Voppel at the IAGA Assembly of Edinburgh (1981) is based on simultaneous measurements taken at 02:00 UT, which coincides with the period least disturbed by Sq associated currents on central European longitudes. A selected list of ten least disturbed days per month is provided by the Niemegk (initially Wingst) Geomagnetic Observatory which gathers the corresponding momentary values from the collaborating institutions. This method can be applied to detect fluctuations or jumps in geomagnetic standards. Independent techniques, like linear regression and axial intercept of the standard deviation of the mutual differences of monthly mean values, have been applied to the magnetic elements of Ebro Observatory (EBR) for the period 1997–2001. These tools give results in good agreement amongst them, and most of the coefficients are similar to those obtained for the most significant observatories of the network. No jumps or trends in data are observed, indicating excellent performance of EBR.

References

  1. Bitterly, J., Declinometre-Inclinometre a Vanne de Flux, Institute de Physique du Globe de Strasbourg, 1990.

    Google Scholar 

  2. Bloxham, J. and D. Gubbins, The secular variation of Earth’s magnetic field, Nature, 317, 777–781, 1985.

    Article  Google Scholar 

  3. Curto, J. J. and E. Sanclement, Levelling error corrections to Dmeasurements in DI-flux magnetometers, Contributions to Geophysics & Geodesy. Geophys. Inst. Slov. Acad. Sci., 31, 111–117, 2001.

    Google Scholar 

  4. Forbes, A. J., General Instrumentation, in Geomagnetism, edited by J. A. Jacobs, 51–136, Vol. 1, Academic Press, London, 1987.

    Google Scholar 

  5. Gaya-Piqué, L. R. and J. M. Torta, El Observatorio Geomagnético de Isla Livingston, Publicaciones del Observatorio del Ebro, Roquetes, 2000.

    Google Scholar 

  6. Jankowsky, J. and Ch. Sucksdorff, Guide for magnetic measurements and observatory practice, IAGA publications, Warsaw, 1996.

    Google Scholar 

  7. Macmillan, S. and S. Maus, International Geomagnetic Reference Field, the third generation, Earth Planets Space, 57, 1135–1140, 2005.

    Article  Google Scholar 

  8. Marsal, S. and J. M. Torta, An evaluation of the uncertainty associated with the measurement of the geomagnetic field with a D/I fluxgate theodolite, Meas. Sci. Technol., 18, 2143–2156, 2007.

    Article  Google Scholar 

  9. Parkinson, W. D., Introduction to Geomagnetism, Elsevier, 1983.

    Google Scholar 

  10. Schulz, G. and M. Beblo, Monitoring Geomagnetic Standards by the comparison of Momentary Values between European observatories in the past, present and future, VIth IAGA workshop on geomagnetic observatory instruments, data acquisition and processing, Dourbes, 1996.

    Google Scholar 

  11. Schulz, G. and I. Gentz, Results of the momentary value comparison between European observatories—a summary of the last two decades, VIIth IAGA workshop on geomagnetic observatory instruments, data acquisition and processing, Niemegk, 1998.

    Google Scholar 

  12. Stuart, W. F., Earth’s Field Magnetometry, Rep. Prog. Phys., 838–847, 1972.

    Google Scholar 

  13. Taylor, J. R., An introduction to error analysis, the study of uncertainties in Physical Measurements, University Science Books, Oxford University Press, 1982.

    Google Scholar 

Download references

Author information

Affiliations

Authors

Corresponding author

Correspondence to J. J. Curto.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Curto, J.J., Marsal, S. Quality control of Ebro magnetic observatory using momentary values. Earth Planet Sp 59, 1187–1196 (2007). https://doi.org/10.1186/BF03352066

Download citation

Key words

  • quality control
  • magnetic observatories