Abstract
New mathematical constructions are developed for the regression smoothing of discrete time series defined on an irregular grid. The new method is used to study secular trends for the period 1991–2015 and relies on observations of three components of the magnetic field at five geomagnetic observatories of the INTERMAGNET network. The detected changes in the trend coincided in time with the jerk properties calculated by conventional methods, which indicates the applicability of the method of regression derivatives to geophysical problems.
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ACKNOWLEDGMENTS
The results presented in this paper rely on data collected at magnetic observatories. We thank the national institutes that support them and INTERMAGNET for promoting high standards of magnetic observatory practice (www.intermagnet.org). We used services of the Collective Use Center “Geomagnetic Analytical Center” of the GC RAS.
Funding
The work was performed within the framework of the state assignment of the GC RAS and approved by the Ministry of Science and Higher Education of Russia.
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Translated by M. Hannibal
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Agayan, S.M., Soloviev, A.A., Bogoutdinov, S.R. et al. Regression Derivatives and Their Application to the Study of Geomagnetic Jerks. Geomagn. Aeron. 59, 359–367 (2019). https://doi.org/10.1134/S0016793219030022
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DOI: https://doi.org/10.1134/S0016793219030022