Regional space-temporal orthogonal model of the geomagnetic secular variation in the Europe for 1980-2009 years

Paper type: 
Oral presentation

REGIONAL SPACE-TEMPORAL ORTHOGONAL MODEL OF THE GEOMAGNETIC SECULAR VARIATION IN THE EUROPE FOR 1980-2009 YEARS

 

Sergey Filippov and Darya Abramova

 

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of Russian Academy of Sciences (IZMIRAN),Troitsk, Moscow Reg., Russia. E-mail:  sfilip@izmiran.ru   

 

The regional space-temporal orthogonal model of the secular variation (SV) of the main geomagnetic field in Europe has been constructed. The model covers years from 1980.0 to 2009.0. As the basic set of experimental data the annual means from magnetic observatories in Europe have been used. These data have been complemented by the measurements at repeat stations. Regions without experimental data have been filled by the synthetic data calculated from IGRF-11’s model. Temporary changes are presented by the decomposition via natural orthogonal components. Spatial behavior is described by Legandre polynomials. The model allows for estimating secular variation of the geomagnetic field at the beginning of each year from the given time interval, for any point of the considered region. The algorithm of model construction does not imply any smoothing of the data. However, as well as in the models presented earlier for other regions of the planet, the presented (regional) model for Europe is substantially more accurate compared with global models of secular variations. The model can be used as for verification of the geomagnetic field SV measurements in the given region, as for the reducing of geomagnetic data from one epoch to other epoch. In the future, at presence of an opportunity, we assume to compare our model to other regional models created on the basis of the SCHA algorithm.

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