Turbulence and the associated turbulent transport of scalar and vector fields is a classical
physics problem that has dazzled scientists for over a century, yet many fundamental …

We report the spontaneous formation of bipolar magnetic structures in direct numerical
simulations of stratified forced turbulence with an outer coronal envelope. The turbulence is …

Recent studies have demonstrated that in fully developed turbulence, the effective magnetic
pressure of a large-scale field (non-turbulent plus turbulent contributions) can become …

In the presence of strong density stratification, hydromagnetic turbulence attains qualitatively
new properties: the formation of magnetic flux concentrations. We review here the theoretical …

Aims. This work presents an extensive study of the previously discovered formation of
bipolar flux concentrations in a two-layer model. We interpret the formation process in terms …

We perform direct numerical simulations of the equations of magnetohydrodynamics with
external random forcing and in the presence of gravity. The domain is divided into two parts …

Context. The mean-field theory of magnetized stellar convection gives rise to two distinct
instabilities: the large-scale dynamo instability, operating in the bulk of the convection zone …

We consider strongly stratified forced turbulence in a plane–parallel layer with helicity and
corresponding large-scale dynamo action in the lower part and non-helical turbulence in the …

Context. Strongly stratified hydromagnetic turbulence has recently been identified as a
candidate for explaining the spontaneous formation of magnetic flux concentrations by the …

Recent work by Mitra et al.(2014) has shown that in strongly stratified forced two-layer
turbulence with helicity and corresponding large-scale dynamo action in the lower layer, and …