Two-dimensional nonstationary magnetogranulation

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Scientific paper

2-D simulation of nonstationary magnetogranulation is analyzed in detail: mechanisms and scenarios leading to formation or cancellation of small-scale magnetic elements, regimes of their stability, size-dependent and field-dependent properties of the tubes formed, as well as brightness properties of simulated magnetogranulation to be compared with the corresponding modeling of non-magnetic granulation. It is noted that magnetic field stabilizes the thermal convection -- shearing instability decreases, simulated granules become smaller. On the other hand, thermal convective flows directly influence the evolution of the small-scale magnetic field. This simulation confirms Vankatakrishnan's conclusion that the thermal mechanism which strengthens the intrinsic magnetic field of thin tubes is highly sensitive to their horizontal sizes. Two regimes of magnetoconvection were found. A change of regimes is detected for the ratio β between gas and magnetic pressure equal approximately to 2.0-2.5. Simulated tubes with a horizontal size of about 150 km are the most frequent contributors to the total area of magnetic tubes.

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