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Kelvin Wave and Its Impact on the Venus Atmosphere Tested by Observing System Simulation Experiment

Amateur Observers Witness the Return of Venus’ Cloud Discontinuity

Hellenic Amateur Astronomy Association, Alopekis 42, 10676 Athens, Greece
Departamento de FAMN, Facultad de Física, Universidad de Sevilla, 41012 Sevilla, Spain
IAASARS, National Observatory of Athens, Lofos Nymfon, Thission, 11810 Athens, Greece
Institute of Astrophysics, FORTH, 70013 Heraklion, Greece
Faculty of Science, Kyoto Sangyo University, Kyoto 603-8555, Japan
Astronomical Society of Australia, Rubyvale, QLD 4702, Australia
Union of Italian Amateur Astronomers, Via Lazio, 14-00040 Rocca di Papa, 26100 Cremona, Italy
Independent Researcher, 09200 Kagarlyk, Kiev Region, Ukraine
AstroCampania Association, 80051 Agerola, Italy
British Astronomical Association, Burlington House, Piccadilly, London W1J 0DU, UK
Asociación Astronómica del Campo de Gibraltar “Luz Cero”, 11351 Castellar de la Frontera, Spain
Private Astronomical Observatory in Massa S. Giorgio, 98100 Messina, Italy
Agrupación Astronómica de la Safor, 46003 Valencia, Spain
Portuguese Association of Amateur Astronomers, 2780-048 Oeiras, Portugal
Faculty of Chemistry, Tallinn University of Technology, 19086 Tallinn, Estonia
Astronomy Society of NSW, P.O. Box 870, Epping, NSW 1710, Australia
Astroqueyras, 05350 Saint-Véran, France
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Michel Blanc and Thomas Smith
Atmosphere 2022, 13(2), 348;
Received: 31 December 2021 / Revised: 4 February 2022 / Accepted: 10 February 2022 / Published: 18 February 2022
Firstly identified in images from JAXA’s orbiter Akatsuki, the cloud discontinuity of Venus is a planetary-scale phenomenon known to be recurrent since, at least, the 1980s. Interpreted as a new type of Kelvin wave, this disruption is associated to dramatic changes in the clouds’ opacity and distribution of aerosols, and it may constitute a critical piece for our understanding of the thermal balance and atmospheric circulation of Venus. Here, we report its reappearance on the dayside middle clouds four years after its last detection with Akatsuki/IR1, and for the first time, we characterize its main properties using exclusively near-infrared images from amateur observations. In agreement with previous reports, the discontinuity exhibited temporal variations in its zonal speed, orientation, length, and its effect over the clouds’ albedo during the 2019/2020 eastern elongation. Finally, a comparison with simultaneous observations by Akatsuki UVI and LIR confirmed that the discontinuity is not visible on the upper clouds’ albedo or thermal emission, while zonal speeds are slower than winds at the clouds’ top and faster than at the middle clouds, evidencing that this Kelvin wave might be transporting momentum up to upper clouds. View Full-Text
Keywords: terrestrial planets; Venus; atmosphere; atmospheric dynamics; atmospheric waves terrestrial planets; Venus; atmosphere; atmospheric dynamics; atmospheric waves
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MDPI and ACS Style

Kardasis, E.; Peralta, J.; Maravelias, G.; Imai, M.; Wesley, A.; Olivetti, T.; Naryzhniy, Y.; Morrone, L.; Gallardo, A.; Calapai, G.; Camarena, J.; Casquinha, P.; Kananovich, D.; MacNeill, N.; Viladrich, C.; Takoudi, A. Amateur Observers Witness the Return of Venus’ Cloud Discontinuity. Atmosphere 2022, 13, 348.

AMA Style

Kardasis E, Peralta J, Maravelias G, Imai M, Wesley A, Olivetti T, Naryzhniy Y, Morrone L, Gallardo A, Calapai G, Camarena J, Casquinha P, Kananovich D, MacNeill N, Viladrich C, Takoudi A. Amateur Observers Witness the Return of Venus’ Cloud Discontinuity. Atmosphere. 2022; 13(2):348.

Chicago/Turabian Style

Kardasis, Emmanuel, Javier Peralta, Grigoris Maravelias, Masataka Imai, Anthony Wesley, Tiziano Olivetti, Yaroslav Naryzhniy, Luigi Morrone, Antonio Gallardo, Giovanni Calapai, Joaquin Camarena, Paulo Casquinha, Dzmitry Kananovich, Niall MacNeill, Christian Viladrich, and Alexia Takoudi. 2022. "Amateur Observers Witness the Return of Venus’ Cloud Discontinuity" Atmosphere 13, no. 2: 348.

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