Zobrazeno 1 - 10
of 148
pro vyhledávání: '"Günther Rüdiger"'
Publikováno v:
Gressel, O, Ruediger, G & Elstner, D 2023, ' Alpha tensor and dynamo excitation in turbulent fluids with anisotropic conductivity fluctuations ', Astronomische Nachrichten, vol. 344, no. 3, e210039 . https://doi.org/10.1002/asna.20210039
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::54377b22981aaa5e92e1ec76dcd1afd3
Autor:
M. Schultz, Günther Rüdiger
A conducting Taylor-Couette flow with quasi-Keplerian rotation law containing a toroidal magnetic field serves as a mean-field dynamo model of the Tayler-Spruit-type. The flows are unstable against nonaxisymmetric perturbations which form electromoti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::de18783374127dbe97dd3b94e476d6d1
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/58744
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/58744
In an earlier paper we showed that the combination of azimuthal magnetic fields and super-rotation in Taylor-Couette flows of conducting fluids can be unstable against non-axisymmetric perturbations if the magnetic Prandtl number of the fluid is $Pm\
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::303a1549e1424bb333fb77148d8af810
Autor:
Günther Rüdiger, Agris Gailitis, Tobias Vogt, Gunter Gerbeth, André Giesecke, Frank Stefani, Th. Gundrum, Martin Seilmayer
Publikováno v:
Geophysical and Astrophysical Fluid Dynamics 113(2019)1-2, 51-70
Magnetic fields of planets, stars and galaxies are generated by self-excitation in moving electrically conducting fluids. Once produced, magnetic fields can play an active role in cosmic structure formation by destabilising rotational flows that woul
Publikováno v:
Geophysical and Astrophysical Fluid Dynamics 112(2018)4, 301-320
The nonaxisymmetric azimuthal magnetorotational instability is studied for hydromagnetic Taylor-Couette flows between cylinders of finite electrical conductivity. We find that the magnetic Prandtl number Pm determines whether perfectly conducting or
Publikováno v:
Geophysical & Astrophysical Fluid Dynamics. 111:429-447
In view of new experimental data the instability against adiabatic nonaxisymmetric perturbations of a Taylor-Couette flow with an axial density stratification is considered in dependence of the Reynolds number Re of rotation and the Brunt-V\"ais\"al\
Autor:
Günther Rüdiger, M. Schultz
The stability of conducting Taylor-Couette flows under the presence of toroidal magnetic background fields is considered. For strong enough magnetic amplitudes such magnetohydrodynamic flows are unstable against nonaxisymmetric perturbations which ma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed207e9daadc032d64d6b2e708275ac4
http://arxiv.org/abs/1907.08291
http://arxiv.org/abs/1907.08291
Rotating stellar convection transports angular momentum towards the equator, generating the characteristic equatorial acceleration of the solar rotation while the radial flux of angular momentum is always inwards. New numerical box simulations for th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b282059b98aa352a3d298fb7f14f26f8
http://arxiv.org/abs/1902.04172
http://arxiv.org/abs/1902.04172
Observations of early-type M stars suggest that there are two characteristic cycle times, one of order one year for fast rotators (Prot < 1 day) and another of order four years for slower rotators. For a sample of fast-rotating stars, the equator-to-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::04fab3ef16f98e8c92d6b2c65e7ef639
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 456:3004-3010