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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 5
Ann. Geophys., 23, 1881-1887, 2005
https://doi.org/10.5194/angeo-23-1881-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 1881-1887, 2005
https://doi.org/10.5194/angeo-23-1881-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 Jul 2005

28 Jul 2005

Results of the Rio de Janeiro magnetic observations 1781−1788

J. M. Vaquero1 and R. M. Trigo2,3 J. M. Vaquero and R. M. Trigo
  • 1Departamento de Física, Escuela Politécnica, Univ. de Extremadura, Avda. de la Universidad s/n, 10071 Cáceres, Spain
  • 2Centro de Geofísica da Universidade de Lisboa, Lisbon, Portugal
  • 3Departamento de Eng. Civil da Universidade Lusófona, Lisbon, Portugal

Abstract. We have compiled a relatively extensive catalogue of geomagnetic declination measurements performed by the Portuguese Bento Sanches Dorta in Rio de Janeiro (Brazil) between 1781 and 1788. All the information was retrieved from printed documents compiled in the first three volumes of the Memories of the Portuguese Royal Academy of Sciences. During this period Sanches Dorta performed roughly 20000 individual observations, however, only a fraction of this data is presently available. In this work, all available information about these measurements is analysed. The annual change (variability and trend) and the daily cycle of geomagnetic declination at monthly scale are discussed.

Keywords. Geomagnetism and paleomagnetism, History of geophysics, Geomagnetic field declination

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