Asymmetrical Stokes profiles are produced if the photospheric magnetic and velocity fields are structured on scales smaller than the mean-free-path of the...
While sunspots are easily observed at the solar surface, determining their subsurface structure is not trivial. There are two main hypotheses for the subsurface...
Net Circular Polarization in Magnetic Spectral Lines Produced by Velocity Gradients: Some Analytical Results
The net circular polarization in a spectral line due to the combined effect of magnetic fields and velocity gradients is analyzed for a few schematic situations...
Non-LTE Polarized Radiative Transfer in Intermediate Magnetic Fields: Numerical Problems and Results
This paper presents some numerical results relative to a solution, based on the density matrix formalism, of the non-LTE, polarized radiative transfer problem...
Nonlinear Numerical Simulations of Magneto-Acoustic Wave Propagation in Small-Scale Flux Tubes
We present results of nonlinear, two-dimensional, numerical simulations of magneto-acoustic wave propagation in the photosphere and chromosphere of small-scale...
On the Connection Between Solar Activity and Low-Latitude Aurorae in the Period 1715 - 1860
Observations of aurorae borealis at low latitudes are very rare and are clearly associated with strong geomagnetic storms. Morphologically, they are...
On the Saturation of Astrophysical Dynamos: Numerical Experiments with the No-Cosines Flow
In the context of astrophysical dynamos we illustrate that the no-cosines flow, with zero mean helicity, can drive fast dynamo action and we study the dynamo’s...