Refined Spatio-Temporal Model of Accelerations
of the Main Geomagnetic Field on the Earth’s Surface
and Geomagnetic Jerks

A. O. Simonyan; Симонян А. О.; M. V. Ohanyan; Оганян М. В.

doi:10.31857/S0016794022600624

Refined Spatio-Temporal Model of Accelerations of the Main Geomagnetic Field on the Earth’s Surface and Geomagnetic Jerks

Authors: Simonyan A.O.¹, Ohanyan M.V.¹
Affiliations:
1. Nazarov Institute of Geophysics and Engineering Seismology, National Academy of Sciences of the Republic of Armenia (IGES NAS RA)
Issue: Vol 63, No 3 (2023)
Pages: 366-390
Section: Articles
URL: https://journals.rcsi.science/0016-7940/article/view/134728
DOI: https://doi.org/10.31857/S0016794022600624
EDN: https://elibrary.ru/POKDOY
ID: 134728

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Abstract
About the authors
References
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Abstract

Refined spatial spherical harmonic models of the piecewise constant field of secular geomagnetic
accelerations have been constructed based on the concept of geomagnetic jerks. The data of the 189 magnetic
observatories operating during the extended period of investigations have been analyzed, assuming that jerks
are manifestation of sharp changes in regimes of quasi-stationary magnetohydrodynamic process of generation
of geomagnetic secular variations in the high-frequency spectrum range. Qualitative and quantitative
analyses have been carried out, showing the persistency of models of the current generation, and their consistency
with the acceleration field values obtained from direct observatory observations data. The epochs of
jerks that occurred in the extended time period were refined and it was found that on the global scale they
have quasi-decadal repeatability, through which it is possible to estimate the time characteristics of regimes
of the stationary evolution of the magnetic field of the Earth’s core. An analysis of the results of spherical harmonic
modeling using the maps of the global field of accelerations showed that the origins of all identified
jerks are of an intraterrestrial character, which also provide the specific features of their morphological structure,
as well as the degree of their distribution on the Earth’s surface

About the authors

A. O. Simonyan

Nazarov Institute of Geophysics and Engineering Seismology, National Academy of Sciences
of the Republic of Armenia (IGES NAS RA)

Email: anahit.iges@gmail.com
Gyumri, 3115 Armenia

M. V. Ohanyan

Nazarov Institute of Geophysics and Engineering Seismology, National Academy of Sciences
of the Republic of Armenia (IGES NAS RA)

Author for correspondence.
Email: marine-0882@mail.ru
Gyumri, 3115 Armenia

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