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Fluid motions in the Earth’s core inferred from time spectral features of the geomagnetic field
Language
English
Obiettivo Specifico
3.4. Geomagnetismo
Status
Published
JCR Journal
JCR Journal
Peer review journal
Yes
Title of the book
Issue/vol(year)
3 / 65 (2002)
Publisher
The American Physical Society
Pages (printed)
037303
Issued date
2002
Abstract
The aim of this work is to investigate the time spectral features of the main geomagnetic field fluctuations as measured on the Earth’s surface in connection with a nontraditional turbulent dynamics of the fluid motions in the outer layers of the Earth’s liquid core. The average geomagnetic field spectrum is found to be a power
law, characterized by a spectral exponent α≈−11/3, on time scales longer than 5 yr. We discuss the spectral exponent in connection with an intense magnetic field in the Earth’s core and with a vortex coalescence process
in a regime of drift-wave turbulence.
law, characterized by a spectral exponent α≈−11/3, on time scales longer than 5 yr. We discuss the spectral exponent in connection with an intense magnetic field in the Earth’s core and with a vortex coalescence process
in a regime of drift-wave turbulence.
References
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@16# Z. Vo¨ro¨s and J. C. Gianibelli, Contrib. Geophys. Geodesy 28,
277 ~1998!.
Magnetic Field of the Earth, Paleomagnetism, the Core, and
the Deep Mantle ~Academic Press, New York, 1996!.
@2# J. Bloxham and A. Jackson, Rev. Geophys. 29, 97 ~1991!.
@3# P. H. Roberts and S. Scott, J. Geomagn. Geoelectr. 17, 137
~1965!.
@4# G. Backus, R. Parker, and C. Constable, Foundations of Geomagnetism
~Cambridge University Press, Cambridge, England,
1996!.
@5# The Summary of Annual Mean Values of Magnetic Elements at
World Magnetic Observatories, edited by V. P. Golovkov, G. I.
Kolomijtzeva, L. P. Konyashenko, and G. M. Semyonova
~Academy of Sciences of the USSR, Moscow, 1983!, Issue
XVI.
@6# W. D. Parkinson, Introduction to Geomagnetism ~Academic
Press, New York, 1983!.
@7# C. E. Barton, Philos. Trans. R. Soc. London, Ser. A 306, 203
~1982!.
@8# C. E. Barton, Geophys. Surv. 5, 335 ~1983!.
@9# R. G. Roberts, Geophys. Surv. 8, 339 ~1986!.
@10# V. Courtillot and J. L. Le Moue¨l, Annu. Rev. Earth Planet Sci.
16, 389 ~1988!.
@11# J. H. Filloux, J. Geomagn. Geoelectr. 32, 1 ~1980!.
@12# S. I. Braginsky and V. P. Meytlis, Geophys. Astrophys. Fluid Dyn. 55, 71 ~1990!.
@13# H. Branover, A. Eidelman, E. Golbraikh, and S. Moiseev, Turbulence
and Structures ~Academic Press, London, 1999!.
@14# N. Kukharkin, S. A. Orsrag, and V. Yakhot, Phys. Rev. Lett.
75, 2486 ~1995!; D. del Castillo-Negrete, Phys. Plasmas 7,
1702 ~2000!.
@15# P. De Michelis, G. Consolini, and A. Meloni, Phys. Rev. Lett.
81, 5023 ~1998!.
@16# Z. Vo¨ro¨s and J. C. Gianibelli, Contrib. Geophys. Geodesy 28,
277 ~1998!.
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