For determining the adiabatic stability of a uniform vertical field in an arbitrary stratification it is sufficient to consider the limit of infinitesimal...
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PublicaciónStability of sunspots to convective motions. I - Adiabatic instability
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PublicaciónStanding sausage waves in photospheric magnetic waveguides
Aims: By focussing on the oscillations of the cross-sectional area and the total intensity of magnetic waveguides located in the lower solar atmosphere, we aim...
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PublicaciónStray-light effects on the solar intensity distribution
A description of the stray-light problem based on a radiative transfer approach is presented. The 2D convolution that describes the effect of the stray-light is...
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PublicaciónStray-light measurements at the Observatorio del Teide
A new procedure to separate the instrumental and atmospheric components of stray light is presented. It is based on the dependence of the aureole's atmospheric...
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PublicaciónStructure of sunspot light bridges in the chromosphere and transition region
Context. Light bridges (LBs) are elongated structures with enhanced intensity embedded in sunspot umbra and pores. Aims: We studied the properties of a sample...
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PublicaciónSunspot irradiance deficit, facular excess, and the energy balance of solar active regions.
Plage areas and intensities derived from CaIIK spectroheliograms are used as a proxy for the facular irradiance excess of solar active regions for the period 19...
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PublicaciónSunspot populations and their relation with the solar cycle
The joint consideration of theoretical and observational arguments is used to conclude that two different spot populations co-exist in the Sun.
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PublicaciónSupersonic Continuation of the Evershed Flow Outside a Sunspot as Observed with Hinode
We report on the discovery of mostly horizontal field channels just outside sunspot penumbrae (in the so-called "moat" region) that are seen to sustain...
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PublicaciónTemporal and center-to-limb variations of the K I 769.9 NM line profiles in quiet and active solar regions
The temporal and spatial behaviour of the K I 769.9 nm solar line are investigated using several series of high spectral resolution low-noise photoelectric...