Session GP1 - Poster Session IV.
POSTER session, Tuesday afternoon, October 28
Fran Hill Southeast Exhibit Hall, ACC
The magnetic field generated from a spherical homogeneous liquid sodium dynamo is explored in terms of the magnetic eigenmodes predicted by Dudley and James. The flow geometry chosen corresponds to the T2S2 flow. It is expected to produce a growing magnetic field at R_m \sim 50 and is created by two counter-rotating propellors driven by 100HP motors with flow velocities up to 15 m/s. The magnetic field is perturbed by pulsing a set of axial coils. The largest growing eigenmode is expected to have a strong equatorial dipole moment. The field is measured using an array of Hall probes both on the surface of the sphere and within the sphere. From the measured field the growth or decay rate of the magnetic eigenmodes are determined. Turbulence in the flow is expected to give rise to modifications of the growth rates and the structure of the eigenmodes.