We report on the disk-averaged absolute brightness temperatures of Venus measured at four microwave frequency bands with the Cosmology Large Angular Scale Surveyor (CLASS). We measure temperatures of 432.3 ± 2.8 K, 355.6 ± 1.3 K, 317.9 ± 1.7 K, and 294.7 ± 1.9 K for frequency bands centered at 38.8, 93.7, 147.9, and 217.5 GHz, respectively. We do not observe any dependence of the measured brightness temperatures on solar illumination for all four frequency bands. A joint analysis of our measurements with lower frequency Very Large Array (VLA) observations suggests relatively warmer (∼ 7 K higher) mean atmospheric temperatures and lower abundances of microwave continuum absorbers than those inferred from prior radio occultation measurements.
Cite
@article{arxiv.2304.07367,
title = {Microwave Observations of Venus with CLASS},
author = {Sumit Dahal and Michael K. Brewer and Alex B. Akins and John W. Appel and Charles L. Bennett and Ricardo Bustos and Joseph Cleary and Jullianna D. Couto and Rahul Datta and Joseph Eimer and Thomas Essinger-Hileman and Jeffrey Iuliano and Yunyang Li and Tobias A. Marriage and Carolina Núñez and Matthew A. Petroff and Rodrigo Reeves and Karwan Rostem and Rui Shi and Deniz A. N. Valle and Duncan J. Watts and Janet L. Weiland and Edward J. Wollack and Zhilei Xu},
journal= {arXiv preprint arXiv:2304.07367},
year = {2023}
}