2012/09/24 by Pavel Hejda, P. Hejda, Hejda, P. +3
Biochemistry, Genetics and Molecular Biology · Earth and Planetary Sciences · Physics and Astronomy · #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Geomagnetism and Paleomagnetism Studies #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics #physics.flu-dyn
paper · pdf · doi:10.48550/arxiv.1209.5314
arxiv created 2012/09/24 · openalex publication_date 2012/09/24 · arxiv updated 2012/09/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Using Lagrangian formalism we consider evolution of the ensemble of interacting magnetohydrodynamic cyclones governed with Langevin type equations in the rotating medium. This problem is relevant to the planetary cores where the Rossby numbers are small and geostrophic balance takes place. We show that variations of the heat flux at the outer boundary of the spherical shell modulates frequency of the reversals of the mean magnetic field that is in accordance with the 3D dynamo simulations. Two scenarios of reversals were bserved. Either the axial dipole decreases in favour of quadrupole and then grows in opposite direction or the mean dipole tilts and reverses without decrease of its amplitude.