ALMA Detection of Dark Chromospheric Holes in the Quiet Sun

Maria A. Loukitcheva, Stephen M. White, Sami K. Solanki

Research output

5 Citations (Scopus)


We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of a quiet-Sun region at a wavelength of 3 mm, obtained during the first solar ALMA cycle on 2017 April 27, and compare them with available chromospheric observations in the UV and visible as well as with photospheric magnetograms. ALMA images clearly reveal the presence of distinct particularly dark/cool areas in the millimeter maps with temperatures as low as 60% of the normal quiet Sun at 3 mm, which are not seen in the other data. We speculate that ALMA is sensing cool chromospheric gas, whose presence had earlier been inferred from infrared CO spectra.

Original languageEnglish
Article numberL26
JournalAstrophysical Journal Letters
Issue number2
Early online date29 May 2019
Publication statusPublished - 1 Jun 2019

Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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