EL ESTUDIO DE LA GENERACION Y LA PROPAGACION DE ONDAS EN LA ATMOSFERA SOLAR ES UN TEMA CANDENTE EN LA INVESTIGACION ASTROFISICA ACTUAL, YA QUE PROPORCIONA INFORMACION SOBRE LA ESTRUCTURA Y LA DINAMICA DE LAS ATMOSFERAS DE LAS ESTRELLAS DE TIPO SOLAR AL MISMO TIEMPO QUE NOS AYUDA A COMPRENDER LOS MECANISMOS DE CALENTAMIENTO CROMOSFERICO Y CORONAL

We present an analysis of simultaneous observations of a sunspot in two different spectral ranges (630 nm and 1565 nm). The dataset was acquired with the POlarimetric LIttrow Spectrograph (POLIS) and the Tenerife Infrared Polarimeter (TIP) at the German Vacuum Tower Telescope (VTT) of Observatorio del Teide. Inversions of both sets of lines are

We took simultaneous observations in Fe I 1.5 µ and Fe I 630 nm of an internetwork region. We discuss the compatibility of the data in the two spectral ranges, and present results for the magnetic field distribution. We show that the larger contribution comes from hG field strengths.

¿Como se forman las galaxias?, ¿Cómo evolucionan?. Éstas son cuestiones fundamentales que las cartografiados profundos de galaxias a alto desplazamiento al rojo tratan de resolver. Una segunda aproximación es reconstruir la historia de la formación estelar a través de sus poblaciones estelares resueltas. La Historia de formación estelar de una

We present first comparisons between high resolution observations of the quiet photosphere, obtained with the Interferometric BIdimensional Spectrometer (IBIS) in the non-magnetic Fe I 7090.4 Å spectral line, and the synthetic spectrum calculated for a 3D snapshot of a radiation-hydrodynamical simulation of the solar atmosphere. Together with

We present a discussion of efforts to obtain external validation of the estimated atmospheric parameters (Teff, log g, [Fe/H]) obtained from medium-resolution (R = 2000) SDSS spectroscopy and ugriz photometry, which are being employed for both the completed SDSS-I and the ongoing SEGUE survey. The SDSS/SEGUE spectroscopic pipeline makes use of a