Astrophysical: Solar activity

  • Publication
    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...
  • Publication
    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...
  • Publication
    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...
  • Publication
    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...
  • Publication
    Rise times of horizontal magnetic flux tubes in the convection zone of the sun
    Solutions of the equations describing the motion of a straight horizontal magnetic flux tube in the convection zone of the sun including inertial term and...
  • Publication
    Seismic Holography of the Solar Interior near the Maximum and Minimum of Solar Activity
    The base of the convection zone and the tachocline play a major role in the study of the dynamics of the Sun, especially in the solar dynamo. Here, we present a...
  • Publication
    Solar structure from global studies of the 5-minute oscillation
    An overall view of the solar surface is presented with emphasis on the study of low 1 value oscillations. Line of sight velocity measurements of the whole solar...
  • Talk
    Solar-terrestrial relations – combined remote sensing and in-situ data
    The Sun is an active star that influences the Earth as well as the entire solar system. Most dynamic phenomena on the Sun are observed as coronal mass ejections...
  • Publication
    Sunspot populations and their relation with the solar cycle
    The joint consideration of theoretical and observational arguments is used to conclude that two different spot populations co-exist in the Sun.