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The Oxford researchers made a model of Saturn's North Pole. A slowly-spinning cylinder of water represented Saturn's atmosphere, and a small, rapidly-spinning ring represented a jet stream. They added some fluorescent green dye, and got a pretty well-defined hexagon.
By playing with the speed of the ring, the researchers could make nearly any shape that they wanted. The greater the difference in speed between the water and the ring, the fewer sides the polygon had. The shape seems to be bound by eddies that slowly orbit and confine the inner ring into the polygon.
Apparently, these shapes are not uncommon in fluid dynamics and can even be seen in hurricanes. This seems to be an example of a well-known phenomenon in one field being relevant to another in a completely unexpected way. But it takes a while for each community to be aware of the other one's results.
Source
Physorg
'The formation of such a steady, symmetrical pattern, slowly drifting around a tank, seems to be directly analogous to what appears to be happening on Saturn itself on a scale of thousands of kilometres,' Peter adds.
The experiments demonstrate that at least one possible end-product of such an instability is the production of a steady, polygonal shape that calculations suggest could also occur on Saturn.
'While this does not prove that Saturn's hexagon definitely occurs via the same processes as in our experiments, it does demonstrate that it could do so, and suggests other things for scientists to look for that may help to improve our understanding of Saturn's atmosphere.'
Saturn's Strange Hexagon Recreated in the Lab
Planetary scientist Kevin Baines of NASA’s Jet Propulsion Laboratory in Pasadena, California, is impressed. “These results are very intriguing,” he says. “The team has formed what I think is a landmark paper that could stand the test of time.” Although the lab experiment does not explain what force is driving this particular jet stream, he says that the results can give real insight into what might be going on in Saturn’s atmosphere.
Originally posted by Violater1
I'm not quite convinced of their research paradigm. Moving gas and or liqiud in a cylinder is quite different than planetary geophysics.
It reminds me of how you can simulate a tornado by using two soda bottles connected together. One is empty, while the other is filled with fluid. You turn it over an the water drains out into the empty bottle. What forms on the top is the "tornado." This simulation has very little to do with the actual meteorological events that form a true tornado.
IMHO.
Originally posted by Violater1
I'm not quite convinced of their research paradigm. Moving gas and or liqiud in a cylinder is quite different than planetary geophysics.
“One of the outstanding problems in the propagation of electron beams along an axial magnetic field is the breakup of the beam into discrete vortex-like current bundles when a threshold determined by either the beam current or distance of propagation is surpassed. The vortices of the diocotron instability are found to occur over 12 orders of magnitude in beam current. This mechanism was first introduced to explain auroral curtains by Hannes Alfvén.”
Originally posted by zeddissad
reply to post by RestingInPieces
While dynamics of gases and liquids are in many respects similar there are not same. Hence statement "Air is fluid" is incorrect. Gases have no such quality as surface tension for example.
We present several independent in-situ measurements, which provide evidence that charged dust in the E-ring interacts collectively with the dense surrounding plasma disk of Saturn, i.e., form a system of dust-plasma interaction.