D. Elstner
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View article: Turbulent Processes and Mean-Field Dynamo
Turbulent Processes and Mean-Field Dynamo Open
Mean-field dynamo theory has important applications in solar physics and galactic magnetism. We discuss some of the many turbulence effects relevant to the generation of large-scale magnetic fields in the solar convection zone. The mean-fi…
View article: Turbulent processes and mean-field dynamo
Turbulent processes and mean-field dynamo Open
Mean-field dynamo theory has important applications in solar physics and galactic magnetism. We discuss some of the many turbulence effects relevant to the generation of large-scale magnetic fields in the solar convection zone. The mean-fi…
View article: Alpha tensor and dynamo excitation in turbulent fluids with anisotropic conductivity fluctuations
Alpha tensor and dynamo excitation in turbulent fluids with anisotropic conductivity fluctuations Open
A mean‐field theory of the electrodynamics of a turbulent fluid is formulated under the assumption that the molecular electric conductivity is correlated with the turbulent velocity fluctuation in the (radial) direction, . It is shown that…
View article: Alpha tensor and dynamo excitation in turbulent fluids with anisotropic conductivity fluctuations
Alpha tensor and dynamo excitation in turbulent fluids with anisotropic conductivity fluctuations Open
A mean-field theory of the electrodynamics of a turbulent fluid is formulated under the assumption that the molecular electric conductivity is correlated with the turbulent velocity fluctuation in the (radial) direction, $\mathbf{g}$. It i…
View article: On the combined role of cosmic rays and supernova-driven turbulence for galactic dynamos
On the combined role of cosmic rays and supernova-driven turbulence for galactic dynamos Open
Large-scale coherent magnetic fields observed in the nearby galaxies are thought to originate by a mean-field dynamo. This is governed via the turbulent electromotive force (EMF, $\overline{{\boldsymbol {\cal E}} {}}$) generated by the hel…
View article: IAU volume 15 issue 354 Cover and Front matter
IAU volume 15 issue 354 Cover and Front matter Open
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View article: On the spatial and temporal non-locality of dynamo mean-field effects in supersonic interstellar turbulence
On the spatial and temporal non-locality of dynamo mean-field effects in supersonic interstellar turbulence Open
The interstellar medium (ISM) of the Milky Way and nearby disc galaxies harbour large-scale coherent magnetic fields of microgauss strength, that can be explained via the action of a mean-field dynamo. As in our previous work, we aim to qu…
View article: Turbulent transport coefficients in galactic dynamo simulations using singular value decomposition
Turbulent transport coefficients in galactic dynamo simulations using singular value decomposition Open
Coherent magnetic fields in disc galaxies are thought to be generated by a large-scale (or mean-field) dynamo operating in their interstellar medium. A key driver of mean magnetic field growth is the turbulent electromotive force (EMF), wh…
View article: Various scenarios for the equatorward migration of sunspots
Various scenarios for the equatorward migration of sunspots Open
The profile of the differential rotation together with the sign of the alpha-effect determine the dynamo wave direction. In early models of the solar dynamo the dynamo wave often leads to a poleward migration of the activity belts. Flux tr…
View article: Delayed Babcock-Leighton dynamos in the diffusion-dominated regime
Delayed Babcock-Leighton dynamos in the diffusion-dominated regime Open
Context . Solar dynamo models of Babcock-Leighton type typically assume the rise of magnetic flux tubes to be instantaneous. The periods of solutions with high magnetic diffusivity are too short, and their active belts do not migrate corre…
View article: Seeking large-scale magnetic fields in a pure-disk dwarf galaxy NGC 2976
Seeking large-scale magnetic fields in a pure-disk dwarf galaxy NGC 2976 Open
It is still unknown how magnetic field-generation mechanisms could operate in low-mass dwarf galaxies. Here, we present a detailed study of a nearby pure-disk dwarf galaxy NGC 2976. Unlike previously observed dwarf objects, this galaxy pos…