In the presence of strong background rotation, the velocity field tends to become quasi-two-
dimensional, which leads to the inverse energy cascade. If the damping is small enough …

Internal gravity waves propagating within homogeneous stratified turbulence are the subject
of the present study. A spatiotemporal analysis is carried out on the results of direct …

We study one-point statistics of helical turbulent pulsations in the background of a three-
dimensional large-scale vortex in a rotating fluid. Assuming that the helical flow is created by …

Kinetic helicity and its spatial distribution are thought to be important for the maintenance of
a dipolar magnetic field in the geodynamo through the α-effect. Outside the inner core …

The preference for the axial dipole in planetary dynamos is investigated through the analysis
of wave motions in spherical dynamo models. Our study focuses on the role of slow …

The distribution of kinetic helicity in a dipolar planetary dynamo is central to the success of
that dynamo. Motivated by the helicity distributions observed in numerical simulations of the …

The evolution of a buoyancy disturbance in a stratified incompressible fluid permeated by a
uniform vertical magnetic field is investigated. Two regimes are considered in the absence of …

Helicity, the inner product of velocity and vorticity, is considered an important ingredient for
the maintenance of a dipolar magnetic field in the geodynamo. Outside the tangent cylinder …

In recent numerical simulations of the geodynamo the dynamo action is driven, primarily, by
the effects of helicity, with differential rotation playing only a secondary role. These dynamos …

Are planetary dynamos driven by helical waves? Page 1 J. Plasma Phys. (2018), vol. 84,
735840304 c Cambridge University Press 2018 doi:10.1017/S0022377818000466 1 REVIEW …