We examine the influence of non-adiabatic effects on the modes of an isothermal stratified magnetic atmosphere. We present new solutions for magneto-acoustic...
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PublicationOn the theory of MAG waves and a comparison with sunspot observations from CDS/SoHO
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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...
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PublicationOptical Tomography of a Sunspot. I. Comparison between Two Inversion Techniques
A quantitative comparison between the Milne-Eddington (ME) inversion technique implemented by Skumanich & Lites and the SIR (Stokes Inversion based on Response...
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PublicationOptical Tomography of a Sunspot. II. Vector Magnetic Field and Temperature Stratification
An observational determination of the three-dimensional magnetic and thermal structure of a sunspot is presented. It has been obtained through the application...
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PublicationOptical Tomography of a Sunspot. III. Velocity Stratification and the Evershed Effect
The stratification with optical depth of the line-of-sight (LOS) velocity of a simple, isolated, round sunspot observed with the Advanced Stokes Polarimeter...
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PublicationOptical Tomography of a Sunspot: Preliminary Results
Preliminary results of the inversion of spectropolarimetric maps of a sunspot observed with the Advanced Stokes Polarimeter (ASP) are presented. The method used...
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PublicationOptically Thin Irregularities in the Penumbrae of Sunspots
Different estimates of the vertical gradient of magnetic field inclination in penumbrae disagree by 2 orders of magnitude. This disagreement may be resolved if...
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PublicationOrigin of the chromospheric three-minute oscillations in sunspot umbrae
Context. Sunspot umbrae show a change in the dominant period of their oscillations from five minutes (3.3 mHz) in the photosphere to three minutes (5.5 mHz) in...
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PublicationOscillations and Waves in Sunspots
A magnetic field modifies the properties of waves in a complex way. Significant advances have been made recently in our understanding of the physics of sunspot...