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Buoyant Magnetic Loops Generated by Global Convective Dynamo Action
Nicholas J. Nelson, Benjamin P. Brown, A. Sacha Brun +2
Our global 3D simulations of convection and dynamo action in a Sun-like star reveal that persistent wreaths of strong magnetism can be built within the bulk of the convention zone.…
Magnetic Activity Cycles in the Exoplanet Host Star epsilon Eridani
T. S. Metcalfe, A. P. Buccino, B. P. Brown +7
The active K2 dwarf epsilon Eri has been extensively characterized, both as a young solar analog and more recently as an exoplanet host star. As one of the nearest and brightest st…
Magnetic Wreaths and Cycles in Convective Dynamos
Nicholas J. Nelson, Benjamin P. Brown, A. Sacha Brun +2
Solar-type stars exhibit a rich variety of magnetic activity. Seeking to explore the convective origins of this activity, we have carried out a series of global 3D magnetohydrodyna…
Optimized boundary driven flows for dynamos in a sphere
I. V. Khalzov, B. P. Brown, C. M. Cooper +2
We perform numerical optimization of the axisymmetric flows in a sphere to minimize the critical magnetic Reynolds number Rm_cr required for dynamo onset. The optimization is done…
Energy Conservation and Gravity Waves in Sound-proof Treatments of Stellar Interiors: Part I Anelastic Approximations
Benjamin P Brown, Geoffrey M Vasil, Ellen G Zweibel
Typical flows in stellar interiors are much slower than the speed of sound. To follow the slow evolution of subsonic motions, various sound-proof equations are in wide use, particu…
Resistive and ferritic-wall plasma dynamos in a sphere
I. V. Khalzov, B. P. Brown, E. J. Kaplan +5
We numerically study the effects of varying electric conductivity and magnetic permeability of the bounding wall on a kinematic dynamo in a sphere for parameters relevant to Madiso…