GROWTH OF THE INNER CORE IN THE MEAN-FIELD DYNAMO MODEL
Аннотация и ключевые слова
Аннотация (русский):
Application of Parker's dynamo model to the geodynamo with the growing inner core is considered. It is shown that decrease of the inner core size, where intensive magnetic field generation takes place, leads to the multi-polar magnetic field in the past. This effect reflects the decrease of the region of the effective magnetic field generation. The process is accompanied by increase of the reversals number and decrease of intensity of the geomagnetic field. The constraints on the mechanisms of convection in the liquid core are discussed.

Ключевые слова:
Evolution of the Earth, magnetic field, evolution of the Earth, $\alpha$-, $\omega$-effects, reversals
Текст
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Список литературы

1. Braginsky, S. I. Nearly axially symmetric model of the hydromagnetic dynamo of the Earth, I, // Geomagnetism and Aeronomy, 1975. - v. 15 - p. 122.

2. Busse, F.-H. Thermal instabilities in rapidly rotating systems, // Fluid Mech., 1970. - v. 44 - p. 441.

3. Busse, F.-H., Simitev, R. D. Toroidal flux oscillation as possible cause of geomagnetic excursions and reversals, // Phys. Earth Planet. Int., 2008. - v. 168 - p. 237.

4. Glatzmaier, G., Roberts, P. H. A three-dimensional convective dynamo solution with rotating and finitely conducting inner core and mantle, // Phys. Earth Planet. Int., 1995. - v. 91 - p. 63.

5. Hoyng, P. Helicity fluctuations in mean field theory: an explanation for the variability of the solar cycle?, // Astron. Astrophys., 1993. - v. 272 - p. 321.

6. Jouve, L., Brun, A. S., Arlt, R., Brandenburg, A., Dikpati, M., Bonanno, A., Käpylä, P. J., Moss, D., Rempel, M., Gilman, P., Korpi, M. J., Kosovichev, A. G. A solar mean field dynamo benchmark, // Astron. Astrophys., 2008. - v. 483 - p. 949.

7. Krause, F., Rädler, K.-H. Mean-field magnetohydrodynamics and dynamo theory - Berlin: Akademie-Verlag., 1980. - 272 pp.

8. Parker, E. N. Hydromagnetic dynamo models, // Astrophys. J., 1995. - v. 122 - p. 293.

9. Reshetnyak, M. Effect of compressibility on the generation of hydrodynamic helicity in the Earth’s liquid core, // Geomagnetism and Aeronomy, 2012. - v. 52 - no. 3 - p. 398.

10. Reshetnyak, M. The mean-field dynamo model in geodynamo, // Russ. J. Earth Sci., 2014. - v. 14 - p. 398.

11. Reshetnyak, M. Parker's model in geodynamo, // Magnetohydodynamics, 2016. - v. 60 - no. 2 - p. 294.

12. Reshetnyak, M., Pavlov, V. Evolution of the Dipole Geomagnetic Field. Observations and Models, // Geomagnetism and Aeronomy, 2016. - v. 56 - no. 1 - p. 110.

13. Roberts, P.-H. On the thermal instability of a rotating-fluid sphere containing heat sources, // Phil.~Trans.~R.~Soc., 1968. - v. A263 - p. 93.

14. Roberts, P.-H., King, E. M. On the genesis of the Earth's magnetism, // Rep. Prog. Phys., 2013. - v. 76 - no. 9 - p. 096801.

15. Sobko, G. S., Zadkov, V. N., Sokolov, D. D., Trukhin, V. I. Geomagnetic reversals in a simple geodynamo model, // Geomagnetism and Aeronomy, 2012. - v. 52 - no. 2 - p. 254.

16. Tarduno, J. A., Cottrell, R. D., Watkeys, M. K., Hofmann, A., Doubrovine, P. V., Mamajek, E. A., Liu, D., Sibeck, D.G., Neukirch, L. P., Usui, Y. Geodynamo, solar wind, and magnetopause 3.4 to 3.45 billion years ago, // Science, 2010. - v. 327 - p. 1238.

17. Wicht, J. Inner-core conductivity in numerical dynamo simulations, // Phys. Earth Planet. Int., 2002. - v. 132 - p. 281.

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