Context: The magnetic and kinematic properties of the photospheric Evershed flow are relatively well known, but not completely understood. The evolution of the...
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PublicationTemporal evolution of the Evershed flow in sunspots. I. Observational characterization of Evershed clouds
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TalkTesting new ideas of sunspot formation: the negative effective magnetic pressure instability
The formation of active regions and its most visible outcome-sunspots-are still a matter of research. Magnetic flux tubes theory tends to explain the formation...
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PublicationThe Canopy Structure above Light Bridges
An analysis of high-resolution Stokes observations of two light bridges in the active region NOAA 8990 is presented. The observations were recorded with the La...
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PublicationThe continuum intensity-magnetic field relation in sunspot umbrae
We describe the work carried out to obtain observational evidence of a local relation between the temperature and the magnetic field in different regions of...
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PublicationThe distribution of sunspot decay rates
The distribution of sunspot decay rates is studied using the Greenwich Photoheliographic Results (GPR) for a total of approximately hundred years between 1874...
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PublicationThe 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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PublicationThe Electrical Current Density Vector in the Inner Penumbra of a Sunspot
We determine the entire electrical current density vector in a geometrical three-dimensional volume of the inner penumbra of a sunspot from an inversion of...
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PublicationThe Evershed Effect Observed with 0.2" Angular Resolution
We present an analysis of the Evershed effect observed with a resolution of 0.2". Using the new Swedish 1 m Solar Telescope and its Littrow spectrograph, we...
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PublicationThe flow field in the sunspot canopy
Aims.We investigate the flow field in the sunspot canopy using simultaneous Stokes vector spectropolarimetry of three sunspots (θ=27°, 50°, 75°) and their...