Journal cover Journal topic
Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.558 IF 1.558
  • IF 5-year value: 1.475 IF 5-year
    1.475
  • CiteScore value: 2.8 CiteScore
    2.8
  • SNIP value: 0.921 SNIP 0.921
  • IPP value: 1.56 IPP 1.56
  • SJR value: 0.571 SJR 0.571
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 55 Scimago H
    index 55
  • h5-index value: 22 h5-index 22
Volume 15, issue 6
Nonlin. Processes Geophys., 15, 873–880, 2008
https://doi.org/10.5194/npg-15-873-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Nonlin. Processes Geophys., 15, 873–880, 2008
https://doi.org/10.5194/npg-15-873-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  24 Nov 2008

24 Nov 2008

Direct and inverse cascades in the geodynamo

M. Reshetnyak1 and P. Hejda2 M. Reshetnyak and P. Hejda
  • 1Institute of the Physics of the Earth, Russian Acad. Sci, 123995 Moscow, Russia
  • 2Institute of Geophysics, Academy of Sciences, 141 31 Prague, Czech Republic

Abstract. The rapid rotation of planets causes cyclonic thermal turbulence in their cores which may generate the large-scale magnetic fields observed outside the planets. We investigate numerically a model based on the geodynamo equations in simplified geometry, which enables us to reproduce the main features of small-scale geostrophic flows in physical and wave vector spaces. We find fluxes of kinetic and magnetic energy as a function of the wave number and demonstrate the co-existence of forward and inverse cascades. We also explain the mechanism of magnetic field saturation at the end of the kinematic dynamo regime.

Publications Copernicus
Download
Citation