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A Phenomenological Model for Reversals of the Geomagnetic Field

  • A. Mazaud
  • C. Laj
  • E. Bard
Part of the NATO ASI Series book series (ASIC, volume 261)

Abstract

We consider a system made by N point interacting dipoles, each of them having a finite lifetime. A renewal process for the dipoles gives the time evolution of the system. When the number N of dipoles is low, and for a wide range of the coupling between the dipoles, we observe sudden transitions or excursions between two polarised states. Thus our system provides artificial polarity time-scales which can be compared with the geomagnetic one. It is also possible, by locating the dipoles within a core and calculating the magnetic field produced, to obtain a simple phenomenological modelling of the geomagnetic field. In this paper we discuss first the characteristics and the time evolution of the generator, then we briefly compare in a qualitative way the modelled field with the geomagnetic one.

Keywords

Total Moment Geomagnetic Data Reversal Frequency Successive Replacement Finite Lifetime 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Labrecque, J., Kent, D.V. and Cande, S.C., 1977. ‘Revised magnetic polarity time scale for the late Cretaceous and Cenozoique time’, Geologie, 5, 330–335.CrossRefGoogle Scholar
  2. Laj, C., Guitton, S. and Kissel, C., 1987. ‘Rapid changes and near stationarity of the geomagnetic field during a polarity reversal’, Nature, 330, 145–148.CrossRefGoogle Scholar
  3. Lowrie, W. and Kent, D., 1983. ‘Geomagnetic reversal frequency since the late Cretaceous’, Earth Planet. Sci. Lett., 62, 305–313.CrossRefGoogle Scholar
  4. Mazaud, A., Laj, C., de Sèze, L. and Verosub, K.L., 1983. ‘15-My periodicity in the frequency of the geomagnetic reversals’, Nature, 304, 328–330.CrossRefGoogle Scholar
  5. Prévot, M., Mankinen, E., Grommé, C. and Coe, R., 1985. ‘How the geomagnetic field reverses polarity’, Nature, 316, 230–234.CrossRefGoogle Scholar
  6. Valet, J.P. and Laj, C., 1984. ‘Invariant and changing transitional field configurations in a sequence of geomagnetic reversals’, Nature, 311, 552–555.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • A. Mazaud
    • 1
  • C. Laj
    • 1
  • E. Bard
    • 1
  1. 1.Centre des Faibles RadioactivitésLaboratoire mixte C.N.R.S. - C.E.AGif-sur-Yvette cedexFrance

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