Geomagnetic field declination: from decadal to centennial scales

Dobrica, Venera; Demetrescu, Crisan; Mandea, Mioara

doi:https://doi.org/10.5194/se-9-491-2018

Articles | Volume 9, issue 2

https://doi.org/10.5194/se-9-491-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/se-9-491-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 9, issue 2

Research article

|

25 Apr 2018

Research article |

| 25 Apr 2018

Geomagnetic field declination: from decadal to centennial scales

Venera Dobrica, Crisan Demetrescu, and Mioara Mandea

Supplement

https://doi.org/10.5194/se-9-491-2018-supplement

Data sets

World Data Center of Geomagnetism, Edinburgh Natural Environment Research Council http://http://www.geomag.bgs.ac.uk/data_service/data/annual_means.shtml

Short summary

By analyzing frequency constituents of declination secular variation at inter-decadal and sub-centennial timescales from geomagnetic observatories with data longer than 1 century and several historical data sets, we suggest that the geomagnetic jerk concept should be considered as a more general notion, namely the evolution of the secular variation as a result of the superposition of two (or more) constituents describing the effects of processes in the Earth’s core at two (or more) timescales.