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pure and applied geophysics

, Volume 109, Issue 1, pp 1781–1788 | Cite as

Excitation of hide waves in the core due to transient-spatially periodic stress in the lower mantle

  • Rishi Narain Singh
Article
  • 23 Downloads

Summary

Forced hydromagnetic oscillations in the outer core due to stress at its top are studied by means of a simple linear theoretical model originally proposed byHide [1] for the free oscillation studies. Both the magnetic and the inertial modes are excited. The expressions for the velocity, magnetic and vorticity fields are presented for a variety of stresses. They depend upon the wave number and frequency. In a numerical example wherein the stress varies periodically both in the space and the time, the amplitude of the induced magnetic field is found to be significant for reasonable values of various parameters.

Keywords

Vorticity Magnetic Mode Lower Mantle Outer Core Vorticity Field 
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. [1]
    R. Hide,On the Earth’s core-mantle interface, Quant. J. Roy. Met. Soc.96 (1970), 579–590.CrossRefGoogle Scholar
  2. [2]
    R. Hide,Free hydromagnetic oscillations of the Earth’s core and the theory of the geomagnetic secular variation, Philitrons, Roy. Soc. Lond.A259 (1966), 615–650.CrossRefGoogle Scholar
  3. [3]
    M. G. Rochester,Core-mantle interactions: Geophysical and astronomical consequences, inEarthquake Displacement Fields and the Rotation of the Earth, edited byL. Mansinha et al. (D. Reidel, Dordrecht, Holland 1970), pp. 136–148.Google Scholar

Copyright information

© Birkhäuser-Verlag 1973

Authors and Affiliations

  • Rishi Narain Singh
    • 1
  1. 1.Physics DepartmentMemorial University of NewfoundlandSt. John’sCanada

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