Astrophysical: Sunspots

  • Publication
    Fine structure and dynamics in a light bridge inside a solar pore
    A photometric analysis of the sub-structure of a granular light bridge in a large solar pore is performed. The data consist of a 66 min time series of white...
  • Publication
    Flow and magnetic field properties in the trailing sunspots of active region NOAA 12396
    Improved measurements of the photospheric and chromospheric three-dimensional magnetic and flow fields are crucial for a precise determination of the origin and...
  • Publication
    Fragments in sunspots
    High-resolution white light and H-alpha observations are used to study the development of 15 large active solar regions. The behavior of the magnetic fragments...
  • Publication
    Fragments in sunspots.
    The following are the main findings: (1) Fragments with typically 1021Mx preserve their identity and even survive to the decay of the sunspots. (2) Each...
  • Publication
    Granulation deformation near and in sunspot regions
    High-resolution white-light pictures are analyzed to study the differences between the granular size near sunspot penumbrae and in light-bridges presenting...
  • Publication
    Heat transfer in sunspot penumbrae. Origin of dark-cored penumbral filaments
    Context: Observations at 0.1 arcsec have revealed the existence of dark cores in the bright filaments of sunspot penumbrae. Expectations are high that such dark...
  • Publication
    Height Dependence of the Penumbral Fine-scale Structure in the Inner Solar Atmosphere
    We studied the physical parameters of the penumbra in a large and fully developed sunspot, one of the largest over the last two solar cycles, by using full...
  • Publication
    Height variation of the cutoff frequency in a sunspot umbra
    Context. In the solar atmosphere, the acoustic cutoff frequency is a local quantity that depends on atmospheric height. It separates low-frequency evanescent...
  • Publication
    Helioseismic holography of simulated sunspots: dependence of the travel time on magnetic field strength and Wilson depression
    Improving methods for determining the subsurface structure of sunspots from their seismic signature requires a better understanding of the interaction of waves...