Zobrazeno 1 - 10
of 65
pro vyhledávání: '"Elstner, Detlef"'
Publikováno v:
Spa. Sci. Rev. 219, 55 (2023)
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-field descrip
Externí odkaz:
http://arxiv.org/abs/2303.12425
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 is shown tha
Externí odkaz:
http://arxiv.org/abs/2301.04509
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{\mathcal{E}} $) generated by the helical turbulence driven b
Externí odkaz:
http://arxiv.org/abs/2010.03654
Publikováno v:
Proc. IAU 15 (2019) 134-137
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 transport by
Externí odkaz:
http://arxiv.org/abs/2003.08131
Autor:
Gressel, Oliver, Elstner, Detlef
The interstellar medium of the Milky Way and nearby disk galaxies harbours 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 quantify dynamo ef
Externí odkaz:
http://arxiv.org/abs/2003.02562
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), which represe
Externí odkaz:
http://arxiv.org/abs/1909.08286
Autor:
Stasyszyn, Federico, Elstner, Detlef
The development of smooth particle magnetohydrodynamic (SPMHD) has significantly improved the simulation of complex astrophysical processes. However, the preservation the solenoidality of the magnetic field is still a severe problem for the MHD. A fo
Externí odkaz:
http://arxiv.org/abs/1411.3290
Publikováno v:
A&A 568, A104 (2014)
We aim to estimate the contribution of the radial component of the Lorentz force to the gas rotation in several types of galaxies. Using typical parameters for the exponential scale of synchrotron emission and the scale length of HI gas, under the as
Externí odkaz:
http://arxiv.org/abs/1407.6998
(Abridged) Based on the rapidly increasing all-sky data of Faraday rotation measures and polarised synchrotron radiation, the Milky Way's magnetic field is now modelled with an unprecedented level of detail and complexity. We aim to complement this h
Externí odkaz:
http://arxiv.org/abs/1310.6209
The emergence of large-scale magnetic fields observed in the diffuse interstellar medium is explained by a turbulent dynamo. The underlying transport coefficients have previously been extracted from numerical simulations. So far, this was restricted
Externí odkaz:
http://arxiv.org/abs/1210.2928