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Structure of the solar photosphere studied from the radiation hydrodynamics code ANTARES

Autor: Leitner, P., Lemmerer, B., Hanslmeier, A., Zaqarashvili, T., Veronig, A., Grimm-Strele, H., Muthsam, H. J.

The ANTARES radiation hydrodynamics code is capable of simulating the solar granulation in detail unequaled by direct observation. We introduce a state-of-the-art numerical tool to the solar physics community and demonstrate its applicability to mode

Externí odkaz: http://arxiv.org/abs/1708.01156

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The size distribution of magnetic bright points derived from Hinode/SOT observations

Autor: Utz, D., Hanslmeier, A., Möstl, C., Muller, R., Veronig, A., Muthsam, H.

Publikováno v: Astron.Astrophys.498:289,2009

Context. Magnetic Bright Points (MBPs) are small-scale magnetic features in the solar photosphere. They may be a possible source of coronal heating by rapid footpoint motions that cause magnetohydrodynamical waves. The number and size distribution ar

Externí odkaz: http://arxiv.org/abs/0912.2637

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Dynamics of isolated magnetic bright points derived from Hinode/SOT G-band observations

Autor: Utz, D., Hanslmeier, A., Muller, R., Veronig, A., Rybák, J., Muthsam, H.

Small-scale magnetic fields in the solar photosphere can be identified in high-resolution magnetograms or in the G-band as magnetic bright points (MBPs). Rapid motions of these fields can cause magneto-hydrodynamical waves and can also lead to nanofl

Externí odkaz: http://arxiv.org/abs/0912.1965

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ANTARES -- A Numerical Tool for Astrophysical RESearch -- With applications to solar granulation

Autor: Muthsam, H. J., Kupka, F., Loew-Baselli, B., Obertscheider, Chr., Langer, M., Lenz, P.

Publikováno v: New Astron.15:460-475,2010

We discuss the general design of the ANTARES code which is intended for simulations in stellar hydrodynamics with radiative transfer and realistic microphysics in 1D, 2D and 3D. We then compare the quality of various numerical methods. We have applie

Externí odkaz: http://arxiv.org/abs/0905.0177

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Effects of resolution and helium abundance in A star surface convection simulations

Autor: Kupka, F., Ballot, J., Muthsam, H. J.

Publikováno v: Communications in Asteroseismology, vol. 160, 30 (2009)

We present results from 2D radiation-hydrodynamical simulations of fully compressible convection for the surface layers of A-type stars with the ANTARES code. Spectroscopic indicators for photospheric convective velocity fields show a maximum of velo

Externí odkaz: http://arxiv.org/abs/0905.0070

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High-resolution models of solar granulation: the 2D case

Autor: Muthsam, H. J., Loew-Baselli, B., Obertscheider, Chr., Langer, M., Lenz, P., Kupka, F.

Using grid refinement, we have simulated solar granulation in 2D. The refined region measures 1.97*2.58 Mm (vertical*horizontal). Grid spacing there is 1.82*2.84 km. The downflows exhibit strong Kelvin-Helmholtz instabilities. Below the photosphere,

Externí odkaz: http://arxiv.org/abs/0706.3349

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