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Akatsuki Venus Climate Orbiter
Webscientist
post Dec 27 2018, 10:36 AM
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Following the inspiring work of Damia on the basis of Akatsuki data, I've recently represented Venus and the Earth at scale.
Here is the outcome:


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JRehling
post Dec 30 2018, 05:51 PM
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I love the comparison. Every now and then I'll look at some hills (on Earth) and imagine how there's some Venusian equivalent up there, of comparable size but different in so many details. Your picture captures the mystery those clouds hid for so many centuries.
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Webscientist
post Dec 30 2018, 10:15 PM
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Our sister planet!
It could have been a tropical world with mean temperatures comparable to the temperatures they are encountering in Australia at the present time but that's far from being the case! blink.gif
Even at the top of Maxwell Montes, it is a hell!

QUOTE (JRehling @ Dec 30 2018, 06:51 PM) *
I love the comparison. Every now and then I'll look at some hills (on Earth) and imagine how there's some Venusian equivalent up there, of comparable size but different in so many details. Your picture captures the mystery those clouds hid for so many centuries.

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Paolo
post Sep 22 2019, 08:46 AM
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some nice animation of the Venusian clouds from this most neglected mission:

Venus puts on variety show among its cloud-tops
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JRehling
post Sep 22 2019, 05:47 PM
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Those animations are magnificent and suddenly make understandable the dynamics that cause the famous Y shape.

This is a great mission.
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palebutdot
post Feb 19 2020, 05:11 PM
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UV Venus animation from this dataset: https://atmos.nmsu.edu/PDS/data/vcouvi_1002/data/l2b/r0100/
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Attached File  venus.mp4 ( 2.36MB ) Number of downloads: 396
 
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Paolo
post Apr 24 2020, 07:45 AM
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some important new result from Akatsuki (the article, unfortunately is paywalled)

How waves and turbulence maintain the super-rotation of Venus’ atmosphere

QUOTE
Abstract
Venus has a thick atmosphere that rotates 60 times as fast as the surface, a phenomenon known as super-rotation. We use data obtained from the orbiting Akatsuki spacecraft to investigate how the super-rotation is maintained in the cloud layer, where the rotation speed is highest. A thermally induced latitudinal-vertical circulation acts to homogenize the distribution of the angular momentum around the rotational axis. Maintaining the super-rotation requires this to be counteracted by atmospheric waves and turbulence. Among those effects, thermal tides transport the angular momentum, which maintains the rotation peak, near the cloud top at low latitudes. Other planetary-scale waves and large-scale turbulence act in the opposite direction. We suggest that hydrodynamic instabilities adjust the angular-momentum distribution at mid-latitudes.
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Roman Tkachenko
post Aug 9 2020, 05:12 PM
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This de-rotated animation shows the night side of Venus in IR.
Near the center you can see a giant, previously unknown planet-scale wave feature.
The animation covers about 14 hours of observations


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JRehling
post Aug 9 2020, 05:43 PM
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QUOTE (Roman Tkachenko @ Aug 9 2020, 10:12 AM) *
This de-rotated animation shows the night side of Venus in IR.
Near the center you can see a giant, previously unknown planet-scale wave feature.
The animation covers about 14 hours of observations


Beautiful work, Roman. I have photographed Venus in UV regularly and it's nice to see the cloud motion occur on this time scale. From Earth, one can see about 3 hours maximum in sequence, and then the change a day later, after which the planet has rotated 90°. Many of the details here are moving on a scale of minutes and it both beautiful and illuminating.

I'm unsure what the planet-scale wave feature is: Is that dark curve across the middle the feature, or an artifact?

Akatsuki found a gigantic planet-scale wave running north to south early in its mission, but the imagery didn't look much like this. Is this another example of that phenomenon?
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