Generation of coronal electric currents due to convective motions on the photosphere

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Convection, Electric Current, Magnetohydrodynamics, Photosphere, Solar Corona, Current Density, Scaling Laws, Solar Magnetic Field

Scientific paper

Generation of electric currents in a magnetized plasma overlying a dense convective layer is studied, assuming that the magnetic field perturbation is small and satisfies the force-free equation. Currents are produced by rotational motions on the boundary in the case of a uniform equilibrium field. In a simple two-dimensional bipolar configuration, however, both irrotational and incompressible motions give rise to currents, and the current density has a peak at the magnetic neutral line. Scaling laws for the current density as well as for the stored magnetic energy are derived, and the possibility of heating the solar corona through the dissipation of coronal currents generated in this way is discussed.

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