Astrofísicas: Manchas solares

  • Publicación
    On the correlation of power in sunspot umbral oscillations with continuum brightness
    We analyze time sequences of spectral lines formed at the photospheric level in order to study the correlation of umbral oscillations with continuum brightness...
  • Publicación
    On the Dynamics of Bright Features in Sunspot Umbrae
    Time series of white-light pictures of the sunspot NOAA 7522, obtained at the Swedish Vacuum Solar Telescope (La Palma), were analyzed to study the proper...
  • Publicación
    On 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...
  • Publicación
    On the fine structure of sunspot penumbrae. I. A quantitative comparison of two semiempirical models with implications for the Evershed effect
    Sunspot penumbrae exhibit prominent fine structure. Different interpretations of spectropolarimetric observations suggest different, sometimes contradictory...
  • Publicación
    On the fine structure of sunspot penumbrae. II. The nature of the Evershed flow
    We investigate the fine structure of the sunspot penumbra by means of a model that allows for a flux tube in horizontal pressure balance with the magnetic...
  • Publicación
    On the fine structure of sunspot penumbrae. III. The vertical extension of penumbral filaments
    In this paper we study the fine structure of the penumbra as inferred from the uncombed model (flux tube embedded in a magnetic surrounding) when applied to...
  • 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
    On the Moat-Penumbra Relation
    Proper motions in a sunspot group with a δ-configuration and close to the solar disk center have been studied by employing local correlation tracking techniques...
  • Publicación
    On the origin of reverse polarity patches found by Hinode in sunspot penumbrae
    Context: The topology of penumbral magnetic fields is poorly known. The satellite Hinode has recently revealed penumbral structures of a magnetic polarity that...