Astrophysical: Sunspots

  • Publication
    The distribution of sunspot decay rates
    The distribution of sunspot decay rates is studied using the Greenwich Photoheliographic Results (GPR) for a total of approximately hundred years between 1874...
  • Publication
    The effect of stellar activity on the Li I 6708, Na I 5896 and K I 7699 Å lines. A comparison with the Pleiades, field stars and the Sun
    An analytical model has been developed to empirically study the effects of stellar spots and faculae on the observed equivalent widths of Li i 6708, Na i 5896...
  • Publication
    The Electrical Current Density Vector in the Inner Penumbra of a Sunspot
    We determine the entire electrical current density vector in a geometrical three-dimensional volume of the inner penumbra of a sunspot from an inversion of...
  • Publication
    The Evershed Effect Observed with 0.2" Angular Resolution
    We present an analysis of the Evershed effect observed with a resolution of 0.2". Using the new Swedish 1 m Solar Telescope and its Littrow spectrograph, we...
  • Publication
    The flow field in the sunspot canopy
    Aims.We investigate the flow field in the sunspot canopy using simultaneous Stokes vector spectropolarimetry of three sunspots (θ=27°, 50°, 75°) and their...
  • Publication
    The flux rope models checked by some observations
    High resolution H alpha and white light observation of the birth of 73 active regions (AR) were used to check models of sunspots. It is concluded that large AR...
  • Talk
    The GREGOR Fabry-Pérot Interferometer: Status, prospects, and scientific aims
    The GREGOR Fabry-Pérot Interferometer (GFPI) is one of the first-light post-focus instruments for the German 1.5-meter GREGOR solar telescope at the...
  • Publication
    The inclination of network magnetic fields
    We have observed the linear polarization of 21 bright grains of the photospheric network close to the disk center. The linear polarization of Fe I 6302.5 A was...
  • Publication
    The KIS Science Data Centre: Concept, Data, Data Access, and Analysis Tools
    With the steady improvement of the observing capabilities and numerical simulations, an efficient data management of large data volumes has become mandatory...