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Numerical study of compressible magnetoconvection with an open transitional boundary

Authors: Hanami, H.; Tajima, T.;

Numerical study of compressible magnetoconvection with an open transitional boundary

Abstract

We study by computer simulation nonlinear evolution of magnetoconvection in a system with a dynamical open boundary between the convection region and corona of the sun. We study a model in which the fluid is subject to the vertical gravitation, magnetohydrodynamics (MHD), and high stratification, through an MHD code with the MacCormack-Donner cell hybrid scheme in order to well represent convective phenomena. Initially the vertical fluid flux penetrates from the convectively unstable zone at the bottom into the upper diffuse atmosphere. As the instability develops, the magnetic fields are twisted by the convection motion and the folding magnetic fields is observed. When the magnetic pressure is comparable to the thermal pressure in the upper layer of convective zone, strong flux expulsion from the convective cell interior toward the cell boundary appears. Under appropriate conditions our simulation exhibits no shock formation incurred by the fluid convected to the photosphere, in contrast to earlier works with box boundaries. The magnetic field patterns observed are those of concentrated magnetic flux tubes, accumulation of dynamo flux near the bottom boundary, pinched flux near the downdraft region, and the surface movement of magnetic flux toward the downdraft region. Many of these computationally observed features aremore » reminiscent of solar observations of the fluid and magnetic structures of their motions.« less

Country
United States
Keywords

Atmospheres, General Physics, Main Sequence Stars, Sun, Fluid Mechanics, Mechanics, Heat Transfer, Convection, Stars, Magnetohydrodynamics, Energy Transfer, Shock Waves, Solar Corona, Hydrodynamics, 71 Classical And Quantum Mechanics, Stellar Coronae 640104* -- Astrophysics & Cosmology-- Solar Phenomena, Boundary Conditions, Mass Transfer, Stellar Atmospheres, Computerized Simulation, Simulation

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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