Astrophysical: Sunspots

  • Publication
    Morphology and evolution of umbral dots and their substructures
    Context: Substructures - dark lanes and tails - of umbral dots (UDs) were predicted by numerical simulations of magnetoconvection and have been detected later...
  • Publication
    Moving Magnetic Features as Prolongation of Penumbral Filaments
    A sequence of 633 high spatial resolution magnetograms and continuum images from SOHO MDI of NOAA AR 0330 is used to study moving magnetic feature (MMF)...
  • Publication
    Naked emergence of an anti-Hale active region. I. Overall evolution and magnetic properties
    Aims: In order to understand the emergence of the active region, we investigate the emerging process and magnetic properties of a naked anti-Hale active region...
  • Publication
    New information about solar rotation
    It is pointed out that the phenomenon of solar rotation is known since the introduction of the telescope into astronomy by Galilei in 1610. Regular measurements...
  • Publication
    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...
  • Publication
    NLTE effects in iron spectrum of sunspots.
    Not Available
  • Publication
    Numerical determination of the cutoff frequency in solar models
    Context. In stratified atmospheres, acoustic waves can only propagate if their frequency is higher than the cutoff value. The determination of the cutoff...
  • Publication
    Numerical Modeling of Magnetohydrodynamic Wave Propagation and Refraction in Sunspots
    We present numerical simulations of magnetoacoustic wave propagation from the photosphere to the low chromosphere in a magnetic sunspot-like structure. A thick...
  • Publication
    Numerical simulation of propagation of the MHD waves in sunspots
    We present results of numerical 3D simulation of propagation of MHD waves in sunspots. We used two self consistent magnetohydrostatic background models of...