Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 877, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/ab2191
Keywords
Sun: atmosphere; Sun: chromosphere; Sun: radio radiation
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Funding
- ESA
- Norwegian Space Centre
- Russian RFBR grant [18-29-21016]
- National Research Foundation (NRF) - Ministry of Education of Korea
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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.
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