Astrophysical: Sunspots

  • Publication
    Numerical Simulations of Conversion to Alfvén Waves in Sunspots
    We study the conversion of fast magnetoacoustic waves to Alfvén waves by means of 2.5D numerical simulations in a sunspot-like magnetic configuration. A fast...
  • Publication
    Observation and interpretation of the asymmetric Stokes Q, U, and V line profiles in sunspots
    We present a first approach to systematic characterization and interpretation of observed asymmetries of Stokes profiles as a function of spatial position...
  • Publication
    Observation and Modeling of Anomalous CN Polarization Profiles Produced by the Molecular Paschen-Back Effect in Sunspots
    We report novel spectropolarimetric observations of sunspots carried out with the Tenerife Infrared Polarimeter in a near-IR spectral region around 15410 Å...
  • 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
    Observed differences between large and small sunspots
    We confirm recent results about the differences in temperature and magnetic field strength between the umbra of large and small sunspots. Five Stokes I- and V...
  • 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 continuum intensity-magnetic field relation along the decay phase of sunspots
    A continuum intensity-magnetic field distributions are presented for a decaying sunspot. It is shown that a very simple model accounts for the observed...
  • Publication
    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...
  • Publication
    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...