Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Rüdiger, Guenther"'
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
Autor:
Rüdiger, Günther, Küker, Manfred
Publikováno v:
A&A 649, A173 (2021)
In order to explain the variance of the solar rotation law during the activity minima and maxima, the angular momentum transport by rotating magnetoconvection is simulated in a convective box penetrated by an inclined azimuthal magnetic field. Turbul
Externí odkaz:
http://arxiv.org/abs/2010.13601
Observations of early-type M stars suggest that there are two characteristic cycle times, one of order one year for fast rotators ($P_{\rm rot} < 1$ day) and another of order four years for slower rotators. For a sample of fast-rotating stars, the eq
Externí odkaz:
http://arxiv.org/abs/1911.13094
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
Externí odkaz:
http://arxiv.org/abs/1804.01501
Autor:
Stefani, Frank, Albrecht, Thomas, Arlt, Rainer, Christen, Michael, Gailitis, Agris, Gellert, Marcus, Giesecke, André, Goepfert, Oliver, Herault, Johann, Kirillov, Oleg, Mamatsashvili, George, Priede, Janis, Ruediger, Guenther, Seilmayer, Martin, Tilgner, Andreas, Vogt, Tobias
Publikováno v:
IOP Conf. Ser.: Mater. Sci. Eng. 228 012002 (2017)
The project A2 of the LIMTECH Alliance aimed at a better understanding of those magnetohydrodynamic instabilities that are relevant for the generation and the action of cosmic magnetic fields. These comprise the hydromagnetic dynamo effect and variou
Externí odkaz:
http://arxiv.org/abs/1705.08189
Decades ago S. Lundquist, S. Chandrasekhar, P.H. Roberts and R. J.~Tayler first posed questions about the stability of Taylor-Couette flows of conducting material under the influence of large-scale magnetic fields. These and many new questions can no
Externí odkaz:
http://arxiv.org/abs/1703.09919
Autor:
Ruediger, Guenther, Kueker, Manfred
Publikováno v:
A&A 592, A73 (2016)
Motivated by the empirical finding that the known hemispheric rules for the current helicity at the solar surface are not strict, the excitation of small-scale current helicity by the influence of a large-scale helical magnetic background fields on n
Externí odkaz:
http://arxiv.org/abs/1601.03877
Publikováno v:
acc. for publication in Journal of Plasma Physics (2018)
It is demonstrated that the azimuthal magnetorotational instability (AMRI) also works with radially increasing rotation rates contrary to the standard magnetorotational instability for axial fields which requires negative shear. The stability against
Externí odkaz:
http://arxiv.org/abs/1601.01964
The empirical finding with data from the Solar Dynamics Observatory (SDO) of positive (negative) horizontal Reynolds stress at the northern (southern) hemisphere for solar giant cells (Hathaway et al. 2013) is discussed for its consequences for the t
Externí odkaz:
http://arxiv.org/abs/1408.3837
The magnetohydrodynamic stability of axially unbounded cylindrical flows is considered which contain a toroidal magnetic background field with the same radial profile as the linear azimuthal velocity. Chandrasekhar (1956) has shown for ideal fluids t
Externí odkaz:
http://arxiv.org/abs/1407.0240