The researchers propose that the huge wave started in the lower atmosphere and propagated to the upper clouds, where Akatsuki recorded it.
The westward wind touches a maximum speed of 100 meters per second at the cloud top altitudes. Dr Colin Wilson told the BBC.
The detected waves were developed in the region called Aphrodite Terra.
For a bit of background into just how unlikely it is for something this big to survive in Venus' atmosphere, the fiery planet boasts thick clouds of sulphuric acid that move in a westerly direction faster than the planet itself rotates on its axis.
"This means that conditions of the lower atmosphere may affect the dynamics of the higher atmosphere by momentum transfer of the gravity waves".
However, what is confusing the experts is that they believe that gravity waves - which was found 65 kilometres above the surface - could not form so high up in the atmosphere of a planet.
"[The Venus Express team] only saw that in one location on Venus. We suggest that the bow-shaped structure is the result of an atmospheric gravity wave generated in the lower atmosphere by mountain topography that then propagated upwards". And "from conventional knowledge" of Venus' atmosphere and their own numerical models, the researchers write, formation of mountain waves "appear difficult".
"The most surprising feature of the bow is that it stayed at nearly same geographical position despite the background atmospheric super-rotation, the uniform westward wind of which the maximum speed is 100 metres/second at the cloud-top altitudes, ' Taguchi explained".
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(Winds blast clouds around Venus at approximately 225 miles per hour.) The "wave" shape formed as gravity tugged at and settled the clouds back into their original equilibrium east of the mountains.
The team hopes to address that question with further observations of the planet, and with that insight, we might finally be able to answer an even bigger question - how did Venus' insane super-rotation occur? To validate their observation, the team conducted a number of computer simulations that showed stationary gravity waves are indeed possible.
'When an air parcel moves upward, its temperature decreases due to adiabatic cooling.
The satellite captured this vision shortly after entering the planet's orbit, and the wave appeared to stand still for several days. "We suggest that winds in the deep atmosphere may be spatially or temporally more valuable than previously thought", the study says, CNet noted.
Venus is a unusual planet.
On Venus, it's the same phenomenon, but in a much more extreme setting.
The Japanese spacecraft swung into orbit around Venus in December 2015 and snapped pictures of the wave until the observations were cut short to allow mission controllers to work on the spacecraft's trajectory and communications.