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RESEARCH PRODUCT
Energy oscillations and a possible route to chaos in a modified Riga dynamo
Agris GailitisFrank StefaniGunter Gerbethsubject
PhysicsEarth and Planetary Astrophysics (astro-ph.EP)Lorentz transformationChaoticFluid Dynamics (physics.flu-dyn)Magnetic Reynolds numberFOS: Physical sciencesAstronomy and AstrophysicsPhysics - Fluid DynamicsPhysics - Plasma PhysicsMagnetic fieldGeophysics (physics.geo-ph)Plasma Physics (physics.plasm-ph)Physics::Fluid DynamicsPhysics - Geophysicssymbols.namesakeAxial compressorSpace and Planetary ScienceQuantum electrodynamicsFictitious forcesymbolsSaturation (magnetic)DynamoAstrophysics - Earth and Planetary Astrophysicsdescription
Starting from the present version of the Riga dynamo experiment with its rotating magnetic eigenfield dominated by a single frequency we ask for those modifications of this set-up that would allow for a non-trivial magnetic field behaviour in the saturation regime. Assuming an increased ratio of azimuthal to axial flow velocity, we obtain energy oscillations with a frequency below the eigenfrequency of the magnetic field. These new oscillations are identified as magneto-inertial waves that result from a slight imbalance of Lorentz and inertial forces. Increasing the azimuthal velocity further, or increasing the total magnetic Reynolds number, we find transitions to a chaotic behaviour of the dynamo.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-09-06 |