'Magnetic buoyancy' diaporamas de présentation

The creation of magnetic structures from velocity shear (Constraints for the solar dynamo)

The creation of magnetic structures from velocity shear (Constraints for the solar dynamo) Nic Brummell Applied Mathematics, University of California Santa Cruz Geoff Vasil, Kelly Cline JILA/APS, University of Colorado Lara Silvers, Mike Proctor DAMTP, University of Cambridge, UK.

734 views • 62 slides

Astrophysical Magnetism

Astrophysical Magnetism. Axel Brandenburg ( Nordita, Stockholm ). Similar physics on different scales. Earth: radius 60 Mm (=6x10 8 m), 0.5 G. Sun: radius 700 Mm (=7x10 8 m), 20-2000 G. Galaxies: radius 10 kpc (=3x10 20 m), 2-20 m G.

429 views • 42 slides

Paradigm shifts in solar dynamo modelling

Paradigm shifts in solar dynamo modelling. Magn. buoyancy, radial diff rot, & quenching ? dynamo at the bottom of CZ Simulations: strong downward pumping Radial diff rot negative near surface! Quenching alleviated by shear-mediated helicity fluxes

441 views • 31 slides

Paradigm shifts in solar dynamo modelling

Paradigm shifts in solar dynamo modelling. Magn. buoyancy, radial diff rot, & quenching ? dynamo at the bottom of CZ Simulations: strong downward pumping Radial diff rot negative near surface! Quenching alleviated by shear-mediated helicity fluxes

326 views • 31 slides

Magnetic structures created by localised velocity shear and magnetic buoyancy

Magnetic structures created by localised velocity shear and magnetic buoyancy. Nic Brummell Kelly Cline Fausto Cattaneo Nic Brummell (303) 492-8962 JILA, University of Colorado brummell@solarz.colorado.edu. Large-scale dynamo: Intuitive picture. toroidal -> poloidal.

295 views • 28 slides

The Test-field Method

367 views • 25 slides

Turbulence simulations showing mean-field dynamos

Turbulence simulations showing mean-field dynamos. Solar paradigm shifts Helicity fluxes Low magnetic Prandtl numbers Mean field coefficients from simulations Axel Brandenburg ( Nordita, Stockholm ). The 4 solar dynamo scenarios. Distributed dynamo (Roberts & Stix 1972)

227 views • 22 slides