Astrofísicas: Manchas solares

  • Publicación
    Structure of sunspot light bridges in the chromosphere and transition region
    Context. Light bridges (LBs) are elongated structures with enhanced intensity embedded in sunspot umbra and pores. Aims: We studied the properties of a sample...
  • Publicación
    Sunspot irradiance deficit, facular excess, and the energy balance of solar active regions.
    Plage areas and intensities derived from CaIIK spectroheliograms are used as a proxy for the facular irradiance excess of solar active regions for the period 19...
  • Publicación
    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.
  • Publicación
    Supersonic Continuation of the Evershed Flow Outside a Sunspot as Observed with Hinode
    We report on the discovery of mostly horizontal field channels just outside sunspot penumbrae (in the so-called "moat" region) that are seen to sustain...
  • Publicación
    Temporal and center-to-limb variations of the K I 769.9 NM line profiles in quiet and active solar regions
    The temporal and spatial behaviour of the K I 769.9 nm solar line are investigated using several series of high spectral resolution low-noise photoelectric...
  • Publicación
    Temporal Evolution of Fine Structures in and around Solar Pores
    Time series of high-resolution white-light images of six solar pores, observed in 1993 and 1995 at the Swedish Vacuum Solar Telescope (La Palma), are analyzed...
  • Publicación
    Temporal evolution of the Evershed flow in sunspots. I. Observational characterization of Evershed clouds
    Context: The magnetic and kinematic properties of the photospheric Evershed flow are relatively well known, but not completely understood. The evolution of the...
  • Charla
    Testing new ideas of sunspot formation: the negative effective magnetic pressure instability
    The formation of active regions and its most visible outcome-sunspots-are still a matter of research. Magnetic flux tubes theory tends to explain the formation...
  • Publicación
    The Canopy Structure above Light Bridges
    An analysis of high-resolution Stokes observations of two light bridges in the active region NOAA 8990 is presented. The observations were recorded with the La...