Astrophysical: Sunspots

  • Publication
    Helioseismic Holography of Simulated Sunspots: Magnetic and Thermal Contributions to Travel Times
    Wave propagation through sunspots involves conversion between waves of acoustic and magnetic character. In addition, the thermal structure of sunspots is very...
  • Publication
    High-resolution imaging and near-infrared spectroscopy of penumbral decay
    Aims: Combining high-resolution spectropolarimetric and imaging data is key to understanding the decay process of sunspots as it allows us to scrutinize the...
  • Publication
    High-Resolution Proper Motions in a Sunspot Penumbra
    Local correlation tracking techniques are used to measure proper motions in a series of high angular resolution (~0.1") penumbra images. If these motions trace...
  • Publication
    Impact of opacity effects on chromospheric oscillations inferred from NLTE inversions
    Context. Spectropolarimetric inversions are a fundamental tool for diagnosing the solar atmosphere. Chromospheric inferences rely on the interpretation of...
  • Publication
    Inference of the chromospheric magnetic field orientation in the Ca ii 8542 Å line fibrils
    Context. Solar chromospheric fibrils, as observed in the core of strong chromospheric spectral lines, extend from photospheric field concentrations suggesting...
  • Publication
    Infrared photometric results of a sunspot
    We obtained simultaneously recorded time series of broadband images of a sunspot close to the disk center at the German Vacuum Tower Telescope, Tenerife, in two...
  • Publication
    Interaction of Convective Structures with the Magnetic Field of Solar Pores
    Time series of high-resolution white-light images of solar pores are analyzed. Granular motions in the vicinity of pores are driven by mesogranular flows...
  • Publication
    Inversion Techniques Applied to Sunspot Spectropolarimetric Data
    Two inversion techniques are compared: the Unno-Rachkov-sky fitting method (UR) and the Stokes Inversion based on Response functions (SIR). Results with...
  • Publication
    Inversions of synthetic umbral flashes: a selection of wavelength sampling
    Context. Imaging spectrographs are popular instruments used to obtain solar data. They record quasi-monochromatic images at selected wavelength positions. By...