Astrophysical: Sunspots

  • Publication
    The Magnetic Response of the Solar Atmosphere to Umbral Flashes
    Chromospheric observations of sunspot umbrae offer an exceptional view of magnetoacoustic shock phenomena and the impact they have on the surrounding...
  • Publication
    The magnetic structure of pores and sunspots derived from Advanced Stokes Polarimeter data.
    We investigate the radial variation of the magnetic field structure across sunspots, pores and azimuth centers (ACs). We define ACs as magnetic structures of...
  • Publication
    The multi-component field topology of sunspot penumbrae. A diagnostic tool for spectropolarimetric measurements
    Context: .Sunspot penumbrae harbor highly structured magnetic fields and flows. The moving flux tube model offers an explanation for several observed phenomena...
  • Publication
    The Possible Ascent of a Closed Magnetic System through the Photosphere
    We present a comprehensive interpretation of the evolution of a small magnetic region observed during its entire disk passage. The vector magnetic field...
  • News
    The presence of resonating cavities above sunspots has been confirmed
    An international team of researchers, led by the Instituto de Astrofísica de Canarias (IAC), has confirmed the existence of resonant cavities above sunspots...
  • Publication
    The role of the chromospheric magnetic canopy in the formation of a sunspot penumbra
    Context. While it is conjectured that a chromospheric canopy plays a role in penumbra formation, it has been difficult to find observational evidence of the...
  • Publication
    The Spectrum of Fluctuations across Penumbral Filaments
    We estimate the typical spectrum of spatial fluctuations of intensity due to the penumbral filaments. High angular resolution continuum images are used (cut-off...
  • Talk
    The stochastic, intermittent nature of quiet Sun magnetism
    The quiet Sun (the 99%, or more, of the solar surface not covered by sunspots or active regions) is receiving increased attention in recent years; its role on...
  • Publication
    The Temperature - Magnetic Field Relation in Observed and Simulated Sunspots
    Observations of the relation between continuum intensity and magnetic field strength in sunspots have been made for nearly five decades. This work presents full...