there is a y shaped wave observed on venus going at ~250 km/h in retrograde direction, does this conform the yarkovsky effect? and as a consequence brake venus' orbital speed ever so slightly? Even the usual Y shape is significant imho.
No, the wave is essentially not moving relative to the ground. No The feature appears to be from the high speed atmosphere going over some highlands. The length of a Venus day is 243 days and the rotation is slightly retrograde. Why?
the waves move around the planet in 4 Earth days, retrograde of course, the rotation of Earth at the equator is ~1000 km/h. the Venus wave would be going at 1/4 that, hence ~250 km/h. Yarkovsky effect, : works in reverse on Venus, the exposed atmosphere is warmed during the day, the accumulated heat would be on the leading side of the orbital direction, and so would be the expanded atmosphere, giving torque to the rotation, but the re-radiation of energy into the orbit direction will act against the orbital movement. Why?--That mechanism could be one of the reason for the open expanded "Y" shape of the atmospheric features. bigger laterally, not only in thickness ,--after expansion by the radiation absorption during the long Venus day, and transported to the leading side of the orbit direction. (the open Y feature faces into the orbit) For the Yarkovsky effect to work, calls only for expansion of features in a radial direction, the Yarkovsky effect: enhancing rotation and lateral movement of a rotating body bathed in radiation, by absorbing radiation in the "day" and re-radiating it at the "evening" side, expanding the atmosphere (or whatever) during the "day" time, and giving greater purchase to the radiation on the expanded "evening "phase, generating force in the direction of the rotation. Both Venus and Earth are helped in rotation by the sun, but Venus is braked in orbital velocity.
that is a bad analogy nebel, if that venus gravity wave moves with the same speed as the atmosphere, it would be the final phase, the bore stage of a tsunami event. interesting as more details emerge.
That is simply incorrect. Read the story again and pay attention. The wave is STATIONARY relative to the planets surface.
Now you think the wave is a gravity wave?? The wave is not moving at the speed of the atmosphere. Have you even read about this or just looked at the picture?
No. It is hypothesisized that the wave is a standing wave from some highlands, similar to lenticular cloud formations seen on earth. Please Register or Log in to view the hidden image!
If that is the case, and that case would be strong, how is it that the wave is not "standing' above the terrain that is only moving at ~4 km/h, when this gravity wave is moving at ~250?, apparently in sync with the atmospheric flow?
sorry, can you give a link to the full story you read? the NYT's might not have given the details I missed and are the leeward standing waves not classified as kinds of gravity waves? Still interesting that the picture indicates a shape that would be predicted by the Yarkovsky effect. Has a Y-shaped mountain shown up on the radar maps of Venus?
Jesus Christ!? It is standing above the terrain! It is not a gravity wave. It is not moving with the atmosphere. This is ridiculous... Every article I have read says and shows the same thing. I'm done wasting my time.
Sorry, I did not read that in the first article. This wave is stationary, a standing wave, but the terrain beneath is not, it has a retrograde rotation. So, how can the wave be stationary, if the possible mountains that cause it are not? The wave could be a bow wave in front of the pressure system that exist on the sunny, and evening side of the atmosphere, the side that faces the orbit. A sunny side has is 30% closer to the sun, gets double the heat, and is exposed 4 times longer. The wave, an upwind reaction to a very strong Venus Yarkovsky effect.
