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First high resolution interferometric observation of a solar prominence with ALMA

Abstract : 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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Submitted on : Thursday, May 19, 2022 - 8:31:20 AM
Last modification on : Saturday, June 25, 2022 - 3:34:06 AM

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Nicolas Labrosse, Andrew Rodger, Krzysztof Radziszewski, Paweł Rudawy, Patrick Antolin, et al.. First high resolution interferometric observation of a solar prominence with ALMA. Monthly Notices of the Royal Astronomical Society: Letters, Oxford Journals, 2022, 513 (1), pp.L30-L34. ⟨10.1093/mnrasl/slac021⟩. ⟨hal-03670838⟩

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