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Firstly identified in images from JAXA's orbiter Akatsuki, the clouddiscontinuity of Venus is a planetary-scale phenomenon known to be recurrentsince, at least, the 1980s. Interpreted as a new type of Kelvin wave, thisdisruption is associated to dramatic changes in the clouds' opacity anddistribution of aerosols, and it may constitute a critical piece for ourunderstanding of the thermal balance and atmospheric circulation of Venus.Here, we report its reappearance on the dayside middle clouds four years afterits last detection with Akatsuki/IR1, and for the first time, we characterizeits main properties using exclusively near-infrared images from amateurobservations. In agreement with previous reports, the discontinuity exhibitedtemporal variations in its zonal speed, orientation, length, and its effectover the clouds' albedo during the 2019/2020 eastern elongation. Finally, acomparison with simultaneous observations by Akatsuki UVI and LIR confirmedthat the discontinuity is not visible on the upper clouds' albedo or thermalemission, while zonal speeds are slower than winds at the clouds' top andfaster than at the middle clouds, evidencing that this Kelvin wave might betransporting momentum up to upper clouds.

Amateur Observers Witness the Return of Venus' Cloud Discontinuity