First high resolution interferometric observation of a solar prominence with ALMA

Labrosse, Nicolas, Rodger, Andrew S., Radziszewski, Krzysztof, Rudawy, Paweł, Antolin, Patrick, Fletcher, Lyndsay, Levens, Peter J., Peat, Aaron W., Schmieder, Brigitte and Simões, Paulo J. A. (2022) First high resolution interferometric observation of a solar prominence with ALMA. Monthly Notices of the Royal Astronomical Society: Letters, 513 (1). L30-L34. ISSN 1745-3925

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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.

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