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https://doi.org/10.5194/essd-2020-317
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2020-317
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  31 Oct 2020

31 Oct 2020

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This preprint is currently under review for the journal ESSD.

Homogenization of the historical series from the Coimbra Magnetic Observatory, Portugal

Anna L. Morozova1,2, Paulo Ribeiro2, and M. Alexandra Pais1,2 Anna L. Morozova et al.
  • 1University of Coimbra, CITEUC, Department of Physics, Coimbra, Portugal
  • 2University of Coimbra, CITEUC, OGAUC, Coimbra, Portugal

Abstract. The Coimbra Magnetic Observatory (COI), Portugal, established in 1866, provides almost continuous records of the geomagnetic field elements for more than 150 years. However, during its long lifetime inevitable changes of the instruments, measurement procedures and even re-location of the Observatory took place. In our previous work (Morozova et al., 2014) we performed homogenization – elimination of the artificial changes – of the measured declination series (D) for the period from 1866 to 2006. In this paper we continue work applying homogenization procedures to the measured series of the absolute monthly values of the horizontal (H, 1866–2006) vertical (Z, 1951–2006) and inclination components (I, 1866–1941). After homogenization of all measured series for the 1866-2006 time interval we performed the homogenization of the series of all geomagnetic field elements (X, Y, Z, H, D, I and F) to the level of epoch 2015. Since all series except D have a gap of about 10 years long in the middle of the 20th century, splitting each of them into two, the homogenization to the level of 2015 was done only for the series available after 1951 (with D series homogenized for the whole time interval 1866–2015). The COI geomagnetic field elements are available via the following addresses: COI original data – https://doi.org/10.5281/zenodo.4122066 (Ribeiro et al, 2020); COI homogenized data – https://doi.org/10.5281/zenodo.4122289 (Morozova et al, 2020).

Anna L. Morozova et al.

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Anna L. Morozova et al.

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Short summary
The Coimbra Magnetic Observatory (COI), Portugal, established in 1866, provides almost continuous records of the geomagnetic field for more than 150 years. However, during its long lifetime inevitable changes of the instruments, measurement procedures and even re-location of the Observatory took place. Such changes affect the quality of the measurements introducing false (artificial) variations. We analyzed COI historical data to find and correct such artificial variations.
The Coimbra Magnetic Observatory (COI), Portugal, established in 1866, provides almost...
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