Sunspot penumbrae exhibit prominent fine structure. Different interpretations of spectropolarimetric observations suggest different, sometimes contradictory...
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PublicationOn the fine structure of sunspot penumbrae. I. A quantitative comparison of two semiempirical models with implications for the Evershed effect
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PublicationOn the fine structure of sunspot penumbrae. II. The nature of the Evershed flow
We investigate the fine structure of the sunspot penumbra by means of a model that allows for a flux tube in horizontal pressure balance with the magnetic...
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PublicationOn the fine structure of sunspot penumbrae. III. The vertical extension of penumbral filaments
In this paper we study the fine structure of the penumbra as inferred from the uncombed model (flux tube embedded in a magnetic surrounding) when applied to...
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PublicationOn the initial orientation of emerging active regions
The initial orientation of 74 active regions (ARs) as measured in high resolution pictures. As previous works by the author (Garcia de la Rosa, 1984) suggest a...
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PublicationOn the Moat-Penumbra Relation
Proper motions in a sunspot group with a δ-configuration and close to the solar disk center have been studied by employing local correlation tracking techniques...
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PublicationOn the origin of reverse polarity patches found by Hinode in sunspot penumbrae
Context: The topology of penumbral magnetic fields is poorly known. The satellite Hinode has recently revealed penumbral structures of a magnetic polarity that...
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PublicationOn the relation between the intensities of bright features and the local background in sunspot umbrae
A photometric study of umbral bright features (umbral dots, clusters of umbral dots, bright grains of light bridges) in sunspots is presented. It is based on...
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PublicationOn the Source of Propagating Slow Magnetoacoustic Waves in Sunspots
Recent high-resolution observations of sunspot oscillations using simultaneously operated ground- and space-based telescopes reveal the intrinsic connection...
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PublicationOn the temperature and velocity through the photosphere of a sunspot penumbra
We investigate the structure in depth of a sunspot penumbra by means of the inversion code of the radiative transfer equation proposed by Ruiz Cobo & del Toro...