Akatsuki Venus Climate Orbiter |
Akatsuki Venus Climate Orbiter |
Dec 27 2018, 10:36 AM
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#721
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Junior Member Group: Members Posts: 98 Joined: 30-November 05 From: Antibes, France Member No.: 594 |
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Dec 30 2018, 05:51 PM
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#722
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
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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Dec 30 2018, 10:15 PM
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#723
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Junior Member Group: Members Posts: 98 Joined: 30-November 05 From: Antibes, France Member No.: 594 |
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! Even at the top of Maxwell Montes, it is a hell! 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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Sep 22 2019, 08:46 AM
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#724
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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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Sep 22 2019, 05:47 PM
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#725
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
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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Feb 19 2020, 05:11 PM
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#726
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Junior Member Group: Members Posts: 48 Joined: 9-August 19 Member No.: 8644 |
UV Venus animation from this dataset: https://atmos.nmsu.edu/PDS/data/vcouvi_1002/data/l2b/r0100/
Attached File(s)
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Apr 24 2020, 07:45 AM
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#727
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
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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Aug 9 2020, 05:12 PM
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#728
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Junior Member Group: Members Posts: 80 Joined: 18-October 15 From: Russia Member No.: 7822 |
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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Aug 9 2020, 05:43 PM
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#729
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
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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Dec 29 2020, 06:10 AM
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#730
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Member Group: Members Posts: 314 Joined: 1-October 06 Member No.: 1206 |
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Apr 25 2023, 06:05 PM
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#731
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Junior Member Group: Members Posts: 98 Joined: 30-November 05 From: Antibes, France Member No.: 594 |
An animation of Venus I produced on the basis of ultraviolet data acquired from the Akatsuki probe on October 30, 2021.
25 images mobilized to generate an animation via extrapolations... Time scale: 5 seconds in the sequence = 1 hour real time. https://www.youtube.com/watch?v=btJ7AmXGWOw |
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Jul 12 2023, 10:28 PM
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#732
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Senior Member Group: Members Posts: 2997 Joined: 30-October 04 Member No.: 105 |
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? Current amateur UV studies of Venus are amazing. One correction: the rotation period of Venus is 243 days and the superrotation of the atmosphere is 96 hours, so that "day later" was a view of the atmosphere. -------------------- |
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Jul 12 2023, 10:36 PM
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#733
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Senior Member Group: Members Posts: 2997 Joined: 30-October 04 Member No.: 105 |
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 Lovely animation. Has that N-S wave been corellated with a topo feature? -------------------- |
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Jul 12 2023, 11:31 PM
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#734
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Solar System Cartographer Group: Members Posts: 10129 Joined: 5-April 05 From: Canada Member No.: 227 |
I have seen several papers associate this feature or others like it with Aphrodite Terra. Here is an example:
https://www.nature.com/articles/ngeo2873 (Large stationary gravity wave in the atmosphere of Venus, by Fukuhara et al., 2017.) Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jul 13 2023, 03:01 PM
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#735
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Member Group: Members Posts: 217 Joined: 14-January 22 Member No.: 9140 |
One correction: the rotation period of Venus is 243 days and the superrotation of the atmosphere is 96 hours, so that "day later" was a view of the atmosphere. A caveat there – the cloud rotation may average about 96 hours but that varies quite a bit, so in any particular span of 3 to 5 days, you might get just about exactly one rotation of the clouds, but you might also have quite a bit of error. Venus Express had some results characterizing this variation, which I think remains unpredictable. |
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