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 Bia{\l}kaw 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 gas temperature of 8000 K.
@article{arxiv.2202.12434,
title = {First High Resolution Interferometric Observation of a Solar Prominence With ALMA},
author = {Nicolas Labrosse and Andrew S. Rodger and Krzysztof Radziszewski and Paweł Rudawy and Patrick Antolin and Lyndsay Fletcher and Peter J. Levens and Aaron W. Peat and Brigitte Schmieder and Paulo J. A. Simões},
journal= {arXiv preprint arXiv:2202.12434},
year = {2022}
}