We present numerical simulations of three-dimensional compressible magnetoconvection in a rotating rectangular box that represents a section of the solar convection zone. The box contains aâ€¦ (More)

Magnetohydrodynamic simulations of fully convective, rotating spheres with volume heating near the center and cooling at the surface are presented. The dynamo-generated magnetic field saturates atâ€¦ (More)

We study the pumping of magnetic flux in three-dimensional compressible magnetoconvection in the context of stellar dynamos. The simulation domain represents a rectangular section from the lower partâ€¦ (More)

For non-radial solar p modes we calculate corrections to the eigenfrequencies arising from the sound speed and velocity inhomogeneity of the convection zone. We use a simple periodic model, andâ€¦ (More)

The interaction of a large-scale stationary poloidal velocity field (as a simple model for possibly existing giant cells) with solar p-mode oscillations is described by quasi-degenerate perturbationâ€¦ (More)

We study the polarization of spectral lines in the penumbra by integrating the radiative transfer equation of polarized light for a three-dimensional model atmosphere of a sunspot. In this model, theâ€¦ (More)

The net circular polarization, N, is used as a measure for the asymmetry of Stokes-V profiles: N â‰¡ V (Î») dÎ», integrated over an absorption line. Exemplary for Fe I 630.2 nm and Fe I 1564.8 nm, weâ€¦ (More)

We investigate the behavior of upward running sound waves in the lower photosphere by means of a 2-hour time series of FPI-filtergrams and a corresponding series of whitelight images. From theâ€¦ (More)

Aims. The Î±and Î³-effects, which are responsible for the generation and turbulent pumping of large scale magnetic fields, respectively, due to passive advection by convection are determined in theâ€¦ (More)

Using 17 hours of full-disk MDI Doppler data we have investigated the center-to-limb variation of the oscillatory wave spectrum of the solar photosphere. Power distributions in thekhÎ½-plane areâ€¦ (More)