Astrofísicas: Actividad solar

  • Charla
    Magnetic bright points in the quiet Sun
    We present a visual determination of the number of bright points (BPs) existing in the quiet Sun, which are structures though to trace intense kG magnetic...
  • Publicación
    Modeling of integrated sunlight velocity measurements: The effect of surface darkening by magnetic fields
    It has been known since the work by Claverie et al. (1982) that integrated-sunlight velocities measured with the resonance scattering technique show variations...
  • Charla
    Mysteries of the magnetic Sun
    The Sun presents us with many unsolved mysteries. In this talk I discuss three of them that have intrigued me for the last 50 years. Solar flares are the most...
  • Publicación
    New windows to the universe; Proceedings of the Eleventh European Regional Astronomy Meeting, Universidad de la Laguna, Spain, July 3-8, 1989. Part II
    Recent observational and theoretical investigations of the sun and sunlike stars and of galactic structure and evolution are discussed in reviews and reports...
  • Publicación
    Nonlinear time-evolution of kink-unstable magnetic flux tubes in the convective zone of the sun
    The nonlinear development of the kink instability in a horizontal magnetic flux tube with a field strength exceeding the equipartition value lying initially in...
  • Publicación
    Observations of the birth and fine structure of sunspot penumbrae
    High resolution white-light pictures of sunspot penumbrae are presented. These include pictures showing details of their filamentary structure and some...
  • Publicación
    On the age dependence of the asymmetry of penumbrae of sunspot
    The age dependence of the recently described asymmetry of penumbrae of large stable sunspots was analyzed. Young sunspots showed shorter eastern penumbrae...
  • Publicación
    On the initial orientation of emerging active regions
    The initial orientation of 74 active regions (ARs) as measured in high resolution pictures. As previous works by the author (Garcia de la Rosa, 1984) suggest a...
  • Publicación
    Photometry of sunspot penumbrae
    The authors present the results of a statistical analysis of the penumbra of sunspots. The intensity distribution, and several parameters derived from it, is...