Abstract
IGRF-12 model data have been used to analyze the change in the global structure of internal sources of the Earth’s magnetic field. A decrease in the dipole magnetic moment is accompanied by a rapid growth of multipole moments. This justifies the theoretical model of the magnetic field inversion as a gradual decrease in the dipole field with general conservation of its direction and amplification of multipole moments. Paleo- and archeomagnetic data indicate that this process has already been taking place for almost 2.5 thousand years and has occurred repeatedly many times in the past. A decrease in the dipole magnetic moment leads the magnetopause to approach the Earth to disappear completely in almost 1.5 thousand years.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
Backus, G., Parker, R.L., and Constable, C., Foundations of Geomagnetism, Cambridge: Cambridge Univ. Press, 1996.
Cande, S.C. and Kent, D.V., Revised calibration of geomagnetic polarity timescale for Late Cretaceous and Cenozoic, J. Geophys. Res., 1995, vol. 100, no. B4, pp. 6093–6095.
Constable, C.G., Geomagnetic reversals: rates, timescales, preferred paths, statistical models, and simulations. Earth’s core and lower mantle, in Fluid Mechanics of Astrophysics and Geophysics, Jones, C.A., Soward, A.M., and Zhang, K., Eds., London, Taylor and Francis, 2003, pp. 96–122.
Jackson, A., Jonkers, A.R.T., and Walker, M.R., Four centuries of geomagnetic secular variation from historical records, Philos. Trans. R. Soc. London A, 2000, vol. 358, pp. 957–990.
Lowrie, W. and Kent, D.V., Geomagnetic polarity timescales and reversal frequency regimes, in Timescales of the Paleomagnetic Field, Channell, J.E.T., Kent, D.V., Lowrie, W., and Meert, J.G., Eds., 2013, vol. 145, pp. 117–129.
Mead, C.D., Deformation of the geomagnetic field by the solar wind, J. Geophys. Res., 1964, vol. 69, pp. 1181–1195.
Paschmann, G., The Earth’s magnetopause, Geomagnetism, 1991, vol. 4, pp. 295–331.
Spreiter, J.R., Alksne, A.Y., and Summers, A.L., External aerodynamics of the magnetosphere, in Physics of the Magnetosphere, Corovillano, R.L., McClay, J.F., and Radoski, H.R., Eds., Dordrecht: D. Reidel, 1968, pp. 301–364.
Thébault, E., Finlay, C.C., Beggan, C.D., et al., International Geomagnetic Reference Field: the 12th generation, Earth Planets Space, 2015, pp. 67–79.
Valet, J.-P. and Fournier, A., Deciphering records of geomagnetic reversals, Rev. Geophys., 2016, vol. 54, pp. 410–446. https://doi.org/10.1002/2015RG000506
Yang, S., Odah, H., and Shaw, J., Variations in the geomagnetic dipole moment over the last 12000 years, Geophys. J. Int., 2000, vol. 140, pp. 158–162.
Zvereva, T.I., Dynamics of the main magnetic field of the Earth from 1900 to present, in Tr. nauch. konf. “Bazy dannykh, instrumenty i informatsionnye osnovy polyarnykh geofizicheskikh issledovanii”, 22–26 maya 2012 g. (Proceedings of the Scientific Conference “Databases, Instruments, and Informational Bases of Polar Geophysical Studies”, 22–26 May 2012), Moscow: IZMIRAN, 2012.
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated by V. Arutyunyan
Rights and permissions
About this article
Cite this article
Petrov, V.G. Future Inversion of the Magnetic Field and Possible Changes in the Structure of the Magnetosphere. Geomagn. Aeron. 59, 356–358 (2019). https://doi.org/10.1134/S0016793219030101
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0016793219030101