@article{SchumacherSeehafer2000,
  author    = {Schumacher, J{\"o}rg and Seehafer, Norbert},
  title     = {Bifurcation analysis of the plane sheet pinch},
  year      = {2000},
  abstract  = {A numerical bifurcation analysis of the electrically driven plane sheet pinch is presented. The electrical conductivity varies across the sheet such as to allow instability of the quiescent basic state at some critical Hartmann number. The most unstable perturbation is the two-dimensional tearing mode. Restricting the whole problem to two spatial dimensions, this mode is followed up to a time-asymptotic steady state, which proves to be sensitive to three- dimensional perturbations even close to the point where the primary instability sets in. A comprehensive three- dimensional stability analysis of the two-dimensional steady tearing-mode state is performed by varying parameters of the sheet pinch. The instability with respect to three-dimensional perturbations is suppressed by a sufficiently strong magnetic field in the invariant direction of the equilibrium. For a special choice of the system parameters, the unstably perturbed state is followed up in its nonlinear evolution and is found to approach a three-dimensional steady state.},
  language  = {en}
}
@article{Seehafer1994,
  author    = {Seehafer, Norbert},
  title     = {Relaxation to equilibrium and inverse energy cascades in solar active regions},
  isbn      = {1-563-47099-3},
  issn      = {0079-6050},
  year      = {1994},
  language  = {en}
}
@article{Seehafer1994,
  author    = {Seehafer, Norbert},
  title     = {Current helicity and the turbulent electromotive force},
  year      = {1994},
  language  = {en}
}
@article{Seehafer1994,
  author    = {Seehafer, Norbert},
  title     = {Alpha effect in the solar atmosphere},
  year      = {1994},
  language  = {en}
}
@article{Seehafer1995,
  author    = {Seehafer, Norbert},
  title     = {The turbulent electromotive force in the high-conductivity limit},
  year      = {1995},
  language  = {en}
}
@article{Seehafer1996,
  author    = {Seehafer, Norbert},
  title     = {Nature of the alpha effect in magnetohydrodynamics},
  year      = {1996},
  language  = {en}
}
@article{Seehafer1998,
  author    = {Seehafer, Norbert},
  title     = {Filaments and the solar dynamo},
  isbn      = {1-88673-370-8},
  year      = {1998},
  language  = {en}
}
@article{SeehaferDemircan2003,
  author    = {Seehafer, Norbert and Demircan, Ayhan},
  title     = {Dynamo action in cellular convection},
  year      = {2003},
  language  = {en}
}
@article{SeehaferDemircanFeudel2001,
  author    = {Seehafer, Norbert and Demircan, Ayhan and Feudel, Fred},
  title     = {Fluid helicity and dynamo effect},
  year      = {2001},
  abstract  = {Using the incompressible magnetohydrodynamic equations, we have numerically studied the dynamo effect in electrically conducting fluids. The necessary energy input into the system was modeled either by an explicit forcing term in the Navier-Stokes equation or fully selfconsistently by thermal convection in a fluid layer heated from below. If the fluid motion is capable of dynamo action, the dynamo effect appears in the form of a phase transition or bifurcation at some critical strength of the forcing. Both the dynamo bifurcation and subsequent bifurcations that occur when the strength of the forcing is further raised were studied, including the transition to chaotic states. Special attention was paid to the helicity of the flow as well as to the symmetries of the system and symmetry breaking in the bifurcations. The magnetic field tends to be accumulated in special regions of the flow, notably in the vicinity of stagnation points or near the boundaries of convection cells.},
  language  = {en}
}
@article{SeehaferFeudelGalanti1998,
  author    = {Seehafer, Norbert and Feudel, Fred and Galanti, B.},
  title     = {Bifurcations in a magnetofluid with helical forcing},
  isbn      = {1-563-47284-8},
  year      = {1998},
  language  = {en}
}
@article{SeehaferFeudelSchmidtmann1996,
  author    = {Seehafer, Norbert and Feudel, Fred and Schmidtmann, Olaf},
  title     = {Nonlinear dynamo with ABC forcing},
  year      = {1996},
  language  = {en}
}
@article{SeehaferFuhrmannValorietal.2007,
  author    = {Seehafer, Norbert and Fuhrmann, M. and Valori, Gherardo and Kliem, Bernhard},
  title     = {Force-free magnetic fields in the solar atmosphere},
  year      = {2007},
  language  = {en}
}
@article{SeehaferGalantiFeudeletal.1996,
  author    = {Seehafer, Norbert and Galanti, B. and Feudel, Fred and R{\"u}diger, Sten},
  title     = {Symmetry breaking bifurcations for the magnetohydrodynamic equations with helical forcing},
  year      = {1996},
  language  = {en}
}
@article{SeehaferGellertKuzanyanetal.2003,
  author    = {Seehafer, Norbert and Gellert, Marcus and Kuzanyan, Kirill M. and Pipin, V. V.},
  title     = {Helicity and the solar dynamo},
  year      = {2003},
  language  = {en}
}
@article{SeehaferSchumacher2000,
  author    = {Seehafer, Norbert and Schumacher, J{\"o}rg},
  title     = {Patterns in an electrically driven conducting fluid layer},
  year      = {2000},
  abstract  = {The equilibrium states of electrically conducting fluids or plasmas have been a subject of intense study for a long time, motivated in particular by the interest in controlled thermonuclear fusion, as well as that in space and astrophysical phenomena such as plasma loops in the solar corona. If high temperatures prohibit solid walls, a conducting fluid can be held together by the action of an electric current passing through it with the pressure gradients being balanced by the Lorentz force. The resultant configuration is known as a pinch. In this paper we report on studies of the pinch in the geometry of a plane sheet.},
  language  = {en}
}
@article{SeehaferSchumacher2000,
  author    = {Seehafer, Norbert and Schumacher, J{\"o}rg},
  title     = {Bifurcation analysis of an electrically driven fluid layer},
  year      = {2000},
  abstract  = {The equilibrium states of electrically conducting fluids or plasmas have been a subject of intense study for a long time, motivated in particular by the interest in controlled thermonuclear fusion, as well as that in space and astrophysical phenomena such as plasma loops in the solar corona. If high temperatures prohibit solid walls, a conducting fluid can be held together by the action of an electric current passing through it with the pressure gradients being balanced by the Lorentz force. The resultant configuration is known as a pinch. In this paper we report on studies of the pinch in the geometry of a plane sheet.},
  language  = {en}
}
@article{SeehaferSchumacher1998,
  author    = {Seehafer, Norbert and Schumacher, J{\"o}rg},
  title     = {Resistivity profile and instability of the plane sheet pinch},
  year      = {1998},
  language  = {en}
}
@article{SeehaferSchumacher1997,
  author    = {Seehafer, Norbert and Schumacher, J{\"o}rg},
  title     = {Squire's theorem for the magnetohydrodynamic sheet pinch},
  year      = {1997},
  language  = {en}
}
@article{SeehaferZienickeFeudel1996,
  author    = {Seehafer, Norbert and Zienicke, Egbert and Feudel, Fred},
  title     = {Absence of magnetohydrodynamic activity in the voltage-driven sheet pinch},
  year      = {1996},
  language  = {en}
}
@article{ZienickeSeehaferFeudel1998,
  author    = {Zienicke, Egbert and Seehafer, Norbert and Feudel, Fred},
  title     = {Bifurcations in two-dimensional Rayleigh-B{\´e}nard convection},
  year      = {1998},
  language  = {en}
}