106 citations · 308 across the 16 of their papers we have counts for
17 papers
One-winged butterflies: mode selection for azimuthal magnetorotational instability by thermal convection
A. Mishra, G. Mamatsashvili, M. Seilmayer +1
The effects of thermal convection on turbulence in accretion discs, and particularly its interplay with the magnetorotational instability (MRI), are of significant astrophysical in…
Experimental investigation of the return flow instability in magnetic spherical Couette flow
Jude Ogbonna, Ferran Garcia, Thomas Gundrum +2
We conduct magnetic spherical Couette (MSC) flow experiments in the return flow instability regime with GaInSn as the working fluid, and the ratio of the inner to the outer sphere…
Four-frequency solution in a magnetohydrodynamic Couette flow as a consequence of azimuthal symmetry breaking
Ferran Garcia, Martin Seilmayer, André Giesecke +1
The occurrence of magnetohydrodynamic (MHD) quasiperiodic flows with four fundamental frequencies in differentially rotating spherical geometry is understood in terms of a sequence…
Long term time dependent frequency analysis of chaotic waves in the weakly magnetized spherical Couette system
Ferran Garcia, Martin Seilmayer, André Giesecke +1
The long therm behavior of chaotic flows is investigated by means of time dependent frequency analysis. The system under test consists of an electrically conducting fluid, confined…
Phase coherence and phase jumps in the Schwabe cycle
F. Stefani, J. Beer, A. Giesecke +4
Guided by the working hypothesis that the Schwabe cycle of solar activity is synchronized by the 11.07 years alignment cycle of the tidally dominant planets Venus, Earth and Jupite…
Chaotic wave dynamics in weakly magnetised spherical Couette flows
Ferran Garcia, Martin Seilmayer, André Giesecke +1
Direct numerical simulations of a liquid metal filling the gap between two concentric spheres are presented. The flow is governed by the interplay between the rotation of the inner…
The Multivariate Extension of the Lomb-Scargle Method
Martin Seilmayer, Ferran Garcia Gonzalez, Thomas Wondrak
The common methods of spectral analysis for multivariate (-dimensional) time series, like discrete Frourier transform (FT) or Wavelet transform, are based on Fourier series to d…
Convection-Caused Symmetry Breaking of Azimuthal Magnetorotational Instability in a Liquid Metal Taylor-Couette Flow
Martin Seilmayer, Jude Ogbonna, Frank Stefani
We report the results of a liquid metal Taylor-Couette experiment in the Rayleigh-stable regime under the influence of an azimuthal magnetic field. We observe that the resulting az…
Modulated rotating waves in the magnetized spherical Couette system
F. Garcia, M. Seilmayer, A. Giesecke +1
We present a study devoted to a detailed description of modulated rotating waves (MRW) in the magnetized spherical Couette system. The set-up consists of a liquid metal confined be…
Laboratory experiments on dynamo action and magnetically triggered flow instabilities
F. Stefani, A. Gailitis, G. Gerbeth +4
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…
Magnetic field dynamos and magnetically triggered flow instabilities
Frank Stefani, Thomas Albrecht, Rainer Arlt +13
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 magn…
The DRESDYN project: planned experiments and present status
Frank Stefani, Sven Eckert, Gunter Gerbeth +5
The Dresden sodium facility for dynamo and thermohydraulic studies (DRESDYN) is a platform for large-scale liquid sodium experiments devoted to fundamental geo- and astrophysical q…
A guide on spectral methods applied to discrete data -- Part I: One-dimensional signals
Martin Seilmayer, Matthias Ratajczak
Spectral analysis in conjunction with discrete data in one and more dimensions can become a challenging task, because the methods are sometimes difficult to understand. This paper…
Laboratory experiments and numerical simulations on magnetic instabilities
F. Stefani, M. Gellert, Ch. Kasprzyk +3
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…
Experimental evidence for non-axisymmetric magnetorotational instability in a rotating liquid metal exposed to an azimuthal magnetic field
Martin Seilmayer, Vladimir Galindo, Gunter Gerbeth +6
The azimuthal version of the magnetorotational instability (MRI) is a non-axisymmetric instability of a hydrodynamically stable differentially rotating flow under the influence of…
Critical fields and growth rates of the Tayler instability as probed by a columnar gallium experiment
Guenther Ruediger, Marcus Gellert, Manfred Schultz +5
Many astrophysical phenomena (such as the slow rotation of neutron stars or the rigid rotation of the solar core) can be explained by the action of the Tayler instability of toroid…
Experimental evidence for Tayler instability in a liquid metal column
Martin Seilmayer, Frank Stefani, Thomas Gundrum +4
In the current-driven, kink-type Tayler instability (TI) a sufficiently strong azimuthal magnetic field becomes unstable against non-axisymmetric perturbations. The TI has been dis…