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On the characteristics of successive geomagnetic jerks

Earth, Planets and Space volume 50, pages 723–732 (1998)Cite this article

Abstract

Spherical harmonic models of the 1969, 1979 and 1992 geomagnetic jerks are computed using data from about 160 worldwide geomagnetic observatories. The dominance of the internal origin part with respect to the external one confirms again the internal origin of these events. A change of sign is observed between two successive jerks (1969–1979, 1979–1992). The acceleration jump of the fluid flow at the core mantle boundary (CMB) generating the three jerks is computed. Striking similarities between the three acceleration maps are observed (within the sign change mentioned above). These results suggest some long time scale memory in the processes that are responsible for the jerks. These processes remain to be elucidated.

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Authors and Affiliations

  1. Institut de Physique du Globe de Paris, B.P. 89, 4 Place Jussieu, 75252, Paris cedex 5, France

    Minh Le Huy, Mioara Alexandrescu, Gauthier Hulot & Jean-Louis Le Mouël

  2. Hanoi Institute of Geophysics, Nghia do - Tu Liem - Hanoi, Vietnam

    Minh Le Huy

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  1. Minh Le Huy
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  2. Mioara Alexandrescu
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  3. Gauthier Hulot
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  4. Jean-Louis Le Mouël
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Correspondence to Minh Le Huy.

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Le Huy, M., Alexandrescu, M., Hulot, G. et al. On the characteristics of successive geomagnetic jerks. Earth Planet Sp 50, 723–732 (1998). https://doi.org/10.1186/BF03352165

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