While sunspots are easily observed at the solar surface, determining their subsurface structure is not trivial. There are two main hypotheses for the subsurface...
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PublicationModeling the Subsurface Structure of Sunspots
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PublicationNet 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...
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PublicationNon-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...
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PublicationNonlinear 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...
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PublicationObservations of Doppler oscillations in a solar prominence
Not Available
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PublicationOn 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...
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PublicationOn the Intensity Thresholds of the Network and Plage Regions
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PublicationOn 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...
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PublicationOn the width distribution of penumbral filaments in sunspots
The width distribution of the penumbral filaments is estimated using white light photographs obtained with a vacuum, Newtonian type telescope. Observations were...