Astrophysical: Sunspots

  • Publication
    Three-dimensional Analysis of a C-class Flare Observed with Sunrise III/SCIP
    Deciphering the physical properties of flares is crucial for understanding the nature of one of the most energetic events on the Sun. We analyze high spatial...
  • Publication
    Three-dimensional structure of a sunspot light bridge
    Context. Active regions are the most prominent manifestations of solar magnetic fields; their generation and dissipation are fundamental problems in solar...
  • Publication
    Tracing p-mode Waves from the Photosphere to the Corona in Active Regions
    Atmosphere above sunspots is abundant with different types of waves. Among these waves are running penumbral waves in the chromosphere, quasi-periodic...
  • Publication
    Turbulent Erosion of Magnetic Flux Tubes
    Results from a numerical and analytical investigation of the solution of a nonlinear axisymmetric diffusion equation for the magnetic field are presented for...
  • Publication
    Twist, Writhe, and Helicity in the Inner Penumbra of a Sunspot
    The aim of this work is the determination of the twist, writhe, and self-magnetic helicity of penumbral filaments located in an inner sunspot penumbra. For this...
  • Publication
    Two magnetic components in sunspot penumbrae
    The magnetic and kinematic configuration of sunspot penumbrae is investigated by performing an inversion of the Stokes profiles of three infrared lines at 1565...
  • Publication
    Umbral dots - A case of penetrative convection between sunspot fragments
    A study of the observations made on the development and, in some cases, even the decay of 15 large active regions is presented. It is shown that the mature...
  • Publication
    Understanding the Travel-time Asymmetry of Acoustic Waves in Sunspots with Time─Distance Helioseismology
    Mapping the subsurface structure and flow field of sunspots has been a challenging task for helioseismology. In this work, we investigate the propagation of...
  • Publication
    Unusual Stokes V profiles during flaring activity of a delta sunspot
    Aims: We analyze a set of full Stokes profile observations of the flaring active region NOAA 10808. The region was recorded with the Vector-Spectromagnetograph...