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6 papers · 2 filters
Magnetic helicity dissipation and production in an ideal MHD code
Axel Brandenburg, Evan Scannapieco
We study a turbulent helical dynamo in a periodic domain by solving the ideal magnetohydrodynamic (MHD) equations with the FLASH code using the divergence-cleaning eight-wave metho…
Topological changes in the magnetic field of LQ Hya during an activity minimum
Jyri J. Lehtinen, Maarit J. Käpylä, Thomas Hackman +6
Previous studies have related surface temperature maps, obtained with the Doppler imaging (DI) technique, of LQ Hya with long-term photometry. We compare surface magnetic field map…
Exploring helical dynamos with machine learning
Farrukh Nauman, Joonas Nättilä
We use ensemble machine learning algorithms to study the evolution of magnetic fields in magnetohydrodynamic (MHD) turbulence that is helically forced. We perform direct numerical…
Reversed dynamo at small scales and large magnetic Prandtl number
Axel Brandenburg, Matthias Rempel
We show that at large magnetic Prandtl numbers, the Lorentz force does work on the flow at small scales and drives fluid motions, whose energy is dissipated viscously. This situati…
Spectral magnetic helicity of solar active regions between 2006 and 2017
Sanjay Gosain, Axel Brandenburg
We compute magnetic helicity and energy spectra from about 2485 patches of about 100 megameters (Mm) side length on the solar surface using data from Hinode during 2006--2017. An e…
Turbulent viscosity and effective magnetic Prandtl number from simulations of isotropically forced turbulence
Petri J. Käpylä, Matthias Rheinhardt, Axel Brandenburg +1
(abridged) Context: Turbulent diffusion of large-scale flows and magnetic fields play major roles in many astrophysical systems. Aims: Our goal is to compute turbulent viscosity an…