arXiv subjects

Pavel Hejda

Publications and source records attributed to Pavel Hejda.

2 recordsLinked to original sources

arXiv2012

Heat flux modulation in domino dynamo model

Using the domino dynamo model, we show how variations of the heat flux at the core-mantle boundary change the frequency of geomagnetic field reversals. In fact, we are able to demonstrate the effect known from the modern 3D planetary dynamo models using an ensemble of interacting spins, which obey equations of the Langevin type with a random force. We also consider applications to the giant planets and offer explanations of some specific episodes of the geomagnetic field in the past.

physics.flu-dyn↗

arXiv2011

Kinetic energy cascades in quasi-geostrophic convection in a spherical shell

We consider triadic nonlinear interaction in the Navier-Stokes equation for quasi-geostrophic convection in a spherical shell. This approach helps understanding the origin of kinetic energy transport in the system and the particular scheme of mode interaction, as well as the locality of the energy transfer. The peculiarity of convection in the sphere, concerned with excitation of Rossby waves, is considered. The obtained results are compared with our previous study in Cartesian geometry.

physics.flu-dyn↗