105 citations · 603 across the 22 of their papers we have counts for
22 papers
No evidence of vorticity production from irrotational turbulent gravitational collapse yet
Axel Brandenburg, Evangelia Ntormousi, Jennifer Schober
Gravitational collapse creates large amounts of kinetic energy that could potentially seed turbulence. If such turbulence were also suitable to initiate dynamo action, the resultin…
Magnetically assisted vorticity production in decaying acoustic turbulence
Axel Brandenburg, Evan Scannapieco
We study vorticity production in isothermal, subsonic, acoustic (nonvortical), and decaying turbulence due to the presence of magnetic fields. Using three-dimensional numerical sim…
Theory of the kinetic helicity effect on turbulent diffusion of magnetic and scalar fields
Igor Rogachevskii, Nathan Kleeorin, Axel Brandenburg
Kinetic helicity is a fundamental characteristics of astrophysical turbulent flows. It is not only responsible for the generation of large-scale magnetic fields in the Sun, stars,…
Helicity effect on turbulent passive and active scalar diffusivities
Axel Brandenburg, Petri J. Käpylä, Igor Rogachevskii +1
Turbulent flows are known to produce enhanced effective magnetic and passive scalar diffusivities, which can fairly accurately be determined with numerical methods. It is now known…
Magnetic helicity and fluxes in an inhomogeneous alpha squared dynamo
A. Brandenburg
Much work on turbulent three-dimensional dynamos has been done using triply periodic domains, in which there are no magnetic helicity fluxes. Here we present simulations where the…
Chiral fermion asymmetry in high-energy plasma simulations
Jennifer Schober, Axel Brandenburg, Igor Rogachevskii
The chiral magnetic effect (CME) is a quantum relativistic effect that describes the appearance of an additional electric current along a magnetic field. It is caused by an asymmet…
Energetics of turbulence generated by chiral MHD dynamos
Jennifer Schober, Axel Brandenburg, Igor Rogachevskii +1
An asymmetry in the number density of left- and right-handed fermions is known to give rise to a new term in the induction equation that can result in a dynamo instability. At high…
Large-scale flow generation by inhomogeneous helicity
Nobumitsu Yokoi, Axel Brandenburg
The effect of kinetic helicity (velocity--vorticity correlation) on turbulent momentum transport is investigated. The turbulent kinetic helicity (pseudoscalar) enters the Reynolds…
Magnetically controlled stellar differential rotation near the transition from solar to anti-solar profiles
Bidya Binay Karak, Petri J. Kapyla, Maarit J. Kapyla +3
Late-type stars rotate differentially owing to anisotropic turbulence in their outer convection zones. The rotation is called solar-like (SL) when the equator rotates fastest and a…
Superflare occurrence and energies on G-, K- and M-type dwarfs
Simon Candelaresi, Andrew Hillier, Hiroyuki Maehara +2
Kepler data from G-, K- and M-type stars are used to study conditions that lead to superflares with energies above . From the 117,661 stars included, 380 show su…
Intense bipolar structures from stratified helical dynamos
Dhrubaditya Mitra, A. Brandenburg, N. Kleeorin +1
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:…
Magnetic flux concentrations in a polytropic atmosphere
I. R. Losada, A. Brandenburg, N. Kleeorin +1
Strongly stratified hydromagnetic turbulence has recently been identified as a candidate for explaining the spontaneous formation of magnetic flux concentrations by the negative ef…
Microphysics of cosmic ray driven plasma instabilities
A. M. Bykov, A. Brandenburg, M. A. Malkov +1
Energetic nonthermal particles (cosmic rays, CRs) are accelerated in supernova remnants, relativistic jets and other astrophysical objects. The CR energy density is typically compa…
Topological constraints in magnetic field relaxation
Simon Candelaresi
Stability and reconnection of magnetic fields play a fundamental role in natural and man-made plasma. In these applications the field's topology determines the stability of the mag…
Surface flux concentrations and spherical alpha-square dynamo
Sarah Jabbari, Axel Brandenburg, Nathan Kleeorin +2
In the presence of strong density stratification, turbulence can lead to a large-scale instability of a horizontal magnetic field if its strength is in a suitable range (within a f…
Topological constraints on magnetic field relaxation
Simon Candelaresi, Axel Brandenburg
Magnetic field relaxation is determined by both the field's geometry and its topology. For relaxation processes, however, it turns out that its topology is a much more stringent co…
Competition of rotation and stratification in flux concentrations
I. R. Losada, A. Brandenburg, N. Kleeorin +1
In a strongly stratified turbulent layer, a uniform horizontal magnetic field can become unstable to spontaneously form local flux concentrations due to a negative contribution of…
Rotational effects on the negative magnetic pressure instability
Illa R. Losada, A. Brandenburg, N. Kleeorin +2
The surface layers of the Sun are strongly stratified. In the presence of turbulence with a weak mean magnetic field, a large-scale instability resulting in the formation of non-un…
The alpha-effect in a turbulent liquid-metal plane Couette flow
G. Ruediger, A. Brandenburg
We calculate the mean electromotive force in plane Couette flows of a nonrotating conducting fluid under the influence of a large-scale magnetic field for driven turbulence. A vert…
Oscillatory large-scale dynamos from Cartesian convection simulations
P. J. Käpylä, M. J. Mantere, A. Brandenburg
We present results from compressible Cartesian convection simulations with and without imposed shear. In the former case the dynamo is expected to be of type which i…
Properties of the negative effective magnetic pressure instability
K. Kemel, A. Brandenburg, N. Kleeorin +1
As was demonstrated in earlier studies, turbulence can result in a negative contribution to the effective mean magnetic pressure, which, in turn, can cause a large-scale instabilit…
Negative effective magnetic pressure in turbulent convection
P. J. Käpylä, A. Brandenburg, N. Kleeorin +2
We investigate the effects of weakly and strongly stratified turbulent convection on the mean effective Lorentz force, and especially on the mean effective magnetic pressure. Earli…