Insight into the solar plage chromosphere with DKIST

David Kuridze*, Han Uitenbroek, Friedrich Wöger, Mihalis Mathioudakis, Huw Morgan, Ryan Campbell, Catherine Fischer, Gianna Cauzzi, Thomas Schad, Kevin Reardon, João M. da Silva Santos, Christian Beck, Alexandra Tritschler, Thomas Rimmele

*Corresponding author for this work

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The strongly coupled hydrodynamic, magnetic, and radiation properties of the plasma in the solar chromosphere make it a region of the Sun's atmosphere that is poorly understood. We use data obtained with the high-resolution Visible Broadband Imager (VBI) equipped with an Hβ filter and the Visible Spectro-Polarimeter (ViSP) on the Daniel K. Inouye Solar Telescope to investigate the fine-scale structure of the plage chromosphere. To aid in the interpretation of the VBI imaging data, we also analyze spectra from the CHROMospheric Imaging Spectrometer on the Swedish Solar Telescope. The analysis of spectral properties, such as enhanced line widths and line depths, explains the high contrast of the fibrils relative to the background atmosphere demonstrating that Hβ is an excellent diagnostic for the enigmatic fine-scale structure of the chromosphere. A correlation between the parameters of the Hβ line indicates that opacity broadening created by overdense fibrils could be the main reason for the spectral line broadening frequently observed in chromospheric fine-scale structures. Spectropolarimetric inversions of the ViSP data in the Ca ii 8542 Å and Fe i 6301/6302 Å lines are used to construct semiempirical models of the plage atmosphere. Inversion outputs indicate the existence of dense fibrils in the Ca ii 8542 Å line. The analyses of the ViSP data show that the morphological characteristics, such as orientation, inclination, and length of fibrils, are defined by the topology of the magnetic field in the photosphere. Chromospheric maps reveal a prominent magnetic canopy in the area where fibrils are directed toward the observer.
Original languageEnglish
Article number15
Number of pages15
JournalThe Astrophysical Journal
Issue number1
Early online date01 Apr 2024
Publication statusPublished - 01 Apr 2024


  • Solar chromosphere
  • Radiative transfer
  • Solar fibrils
  • Ground-based astronomy
  • Plages
  • High resolution spectroscopy


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