Articles | Volume 15, issue 2
https://doi.org/10.5194/hgss-15-81-2024
https://doi.org/10.5194/hgss-15-81-2024
Article
 | 
13 Nov 2024
Article |  | 13 Nov 2024

Historical evolution of the geomagnetic declination at the Royal Observatory of Madrid

Jose Manuel Tordesillas, Francisco Javier Pavón-Carrasco, Alberto Nuñez, and Ana Belén Anquela

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Cited articles

Alexandrescu, M., Courtillot, V., and Le Mouël, J. L.: Geomagnetic field direction in Paris since the mid-sixteenth century, Phys. Earth Planet. Inter., 98, 321–360, 1996. 
Arneitz, P., Leonhardt, R., Schepp, E., Heilig, B., Mayrhofer, F., Kovacs, P., Hejda, P., Valach, F., Vadasz, G., Hammerl, C., Egli, R., Fabian, K., and Kompein, N.: The HISTMAG database: combinating historical, archeomagnetic and volcanic data, Geophysi. J. Int., 210, 1347–1359, https://doi.org/10.1093/gji/ggx245, 2017. 
Azpiazu, U. and Gil, R.: Magnetismo terrestre. Su estudio en España, Instituto Geográfico y Catastral, Madrid, 100 pp., Toledo Geophysical Observatory, 1919. 
Batlló, J.: Catálogo inventario de magnetómetros españoles, Instituto Geográfico Nacional, Madrid, 305 pp., ISBN 84-9810-728-8, 2005. 
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Short summary
In December 2021, the agonic line crossed the Royal Observatory of Madrid on its westward drift. The previous crossing by the agonic line, drifting eastward, is not accurately dated because declination measurements of that time are scarce. After collecting the data obtained in the Iberian Peninsula over the last 500 years and reducing them to ROM coordinates, a geomagnetic declination curve was generated. As a result, the previous cross ing been the agonic line was dated around the year 1652.