Time series of high-resolution white-light images of solar pores are analyzed. Granular motions in the vicinity of pores are driven by mesogranular flows: Motions toward the pore dominate in the 2 arcsec zone around the pore boundary, while at larger distances the granules move away from the pore. Triggered by these motions, small granules and

From an observational point of view, magnetic field leaves its imprint, via Zeeman effect, on spectral line splitting and the induced wavelength dependence of the polarization state of the observed photons. The characteristics of the most recent polarimetric analyzers are described, together with their limitations. Next, inversion techniques are

En esta memoria de tesis llevamos a cabo la exposición de los resultados más interesantes obtenidos durante los últimos cuatro años de investigación sobre los procesos de formación estelar y la cinemática del gas ionizado en un grupo de galaxias Wolf-Rayet. Nuestro estudio se ha basado en la obtención de imágenes en la línea de emisión de Ha y en

Not Available

During the years 1996 through 1998 the MDI and GOLF experiments on the SOHO mission have provided unique and nearly uninterrupted sequences of helioseismic observations. This paper describes the analysis carried out on power spectra from 759 days of calibrated velocity signals provided by these two experiments. The time series investigated in this

The advent of large 8-10m telescopes heralds a new age in stellar astronomy. It is now possible to carry out detailed spectroscopic observations at high resolution of the brightest stars of galaxies in the Local Group, and it is envisaged that intermediate resolution observations will be extended to stars in the nearest galaxy clusters such as