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Nonlinear MHD Rossby wave interactions and persistent geomagnetic field structures.

Breno Raphaldini1, Carlos F M Raupp1

  • 1Institute of Astronomy, Geophysics and Atmospheric Sciences, University of Sao Paulo, Sao Paulo, Brazil.

Proceedings. Mathematical, Physical, and Engineering Sciences
|October 19, 2020
PubMed
Summary
This summary is machine-generated.

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Geomagnetic field lobes may result from nonlinear stationary waves at the Earth

Area of Science:

  • Geophysics
  • Earth Science
  • Magnetohydrodynamics

Background:

  • Stationary features in the geomagnetic field, like flux lobes, are linked to core-mantle boundary inhomogeneities.
  • A stratified layer at the Earth's core top influences core dynamics and mantle-core interactions.

Purpose of the Study:

  • To introduce theories of magnetic Rossby waves in a thin shell at the Earth's core top.
  • To investigate nonlinear wave interactions under thermal and topographic forcings from the mantle base.

Main Methods:

  • Development of linear and nonlinear theories for magnetic Rossby waves.
  • Analysis of nonlinear wave interactions with prescribed forcings.

Main Results:

  • Wave phases can lock to specific longitudes due to combined forcing and nonlinear effects.
Keywords:
Rossby wavesgeomagnetismnonlinear interactions

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  • This generates quasi-stationary flow patterns with a meridional component.
  • Solutions exhibit analogies to atmospheric blocking phenomena.

    • Conclusions:

    • Persistent geomagnetic structures, such as flux lobes, may arise from nonlinear stationary wave blocking at the Earth's core top.
    • This provides a potential mechanism for long-lived geomagnetic field features.