Sunspots and physics of magnetic flux tubes overstability and Kelvin-Helmholtz instability in a magnetic field

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Kelvin-Helmholtz Instability, Magnetic Flux, Solar Magnetic Field, Sunspots, Magnetohydrodynamic Waves, Viscosity, Wave Propagation

Scientific paper

The authors have studied the dynamical properties of convective overstability and Kelvin-Helmholtz instability in a vertical magnetic field with a downdraft. The Kelvin-Helmholtz instability and overstability produce the upward downward propagating Alfvén waves depending upon the magnitudes of the kinematic viscosity coefficient (eddy viscosity) ν, and thermometric conductivity κ. It is found that the instability may be driven by the density stratification and the effect of the eddy viscosity is to make the system stable. The authors discuss also the interaction of the overstability in x < 0 and the downdraft in x > 0, and the overstability at a vertical boundary of the field.

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