Simultaneous broadband single images and time series of images have been obtained at λ0.8 and λ1.55 μm, which are at the extremes of the continuum absorption...
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PublicaciónInfrared Photometry of Solar Photospheric Structures. II. Center-to-Limb Variation of Active Regions
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PublicaciónOn the Energy Balance of Solar Active Regions
Ground-based observations of the sunspot irradiance deficit Ψ and the excess by facular regions in the period 1989 June 3-15 are analyzed using photometric...
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PublicaciónProbing downflows in solar magnetic elements: the Fe II test
In an attempt to assess the physical realism of the plage flux tube model derived by Bellot Rubio, Ruiz Cobo & Collados (cite{brc}, cite{bellot}) we extend its...
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PublicaciónProperties of convective motions in facular regions
Aims: We study the properties of solar granulation in a facular region from the photosphere up to the lower chromosphere. Our aim is to investigate the...
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PublicaciónRelationships between magnetic foot points and G-band bright structures
Aims:Magnetic elements are thought to be described by flux tube models, and are well reproduced by MHD simulations. However, these simulations are only...
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PublicaciónSolar Hα excess during Solar Cycle 24 from full-disk filtergrams of the Chromospheric Telescope
Context. The chromospheric Hα spectral line is a strong line in the spectrum of the Sun and other stars. In the stellar regime, this spectral line is already...
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PublicaciónSUNRISE: Instrument, Mission, Data, and First Results
The SUNRISE balloon-borne solar observatory consists of a 1 m aperture Gregory telescope, a UV filter imager, an imaging vector polarimeter, an image...
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PublicaciónThe effect of stellar activity on the Li I 6708, Na I 5896 and K I 7699 Å lines. A comparison with the Pleiades, field stars and the Sun
An analytical model has been developed to empirically study the effects of stellar spots and faculae on the observed equivalent widths of Li i 6708, Na i 5896...
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PublicaciónThe Magnetic Landscape of the Sun's Polar Region
We present observations of the magnetic landscape of the polar region of the Sun that are unprecedented in terms of spatial resolution, field of view, and...