First high resolution interferometric observation of a solar prominence with ALMA

Nicolas Labrosse*, Andrew S. Rodger, Krzysztof Radziszewski, Paweł Rudawy, Patrick Antolin, Lyndsay Fletcher, Peter J. Levens, Aaron W. Peat, Brigitte Schmieder, Paulo J. A. Simões

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

Abstract

We present the first observation of a solar prominence at 84 − 116 GHz using the high resolution interferometric imaging of ALMA. Simultaneous observations in Hα from Białkaw Observatory and with SDO/AIA reveal similar prominence morphology to the ALMA observation. The contribution functions of 3 mm and Hα emission are shown to have significant overlap across a range of gas pressures. We estimate the maximum millimetre-continuum optical thickness to be τ3mm ≈ 2, and the brightness temperature from the observed Hα intensity. The brightness temperature measured by ALMA is ∼6000 − 7000 K in the prominence spine, which correlates well with the estimated brightness temperature for a kinetic temperature of 8000 K.
Original languageEnglish
Article numberslac021
Pages (from-to)L30-L34
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume513
Issue number1
Early online date7 Mar 2022
DOIs
Publication statusPublished - 11 Jun 2022

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