Saturn’s Hexagon "Recreated"

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Saturn’s Hexagon "Recreated"

Unread postby Solar » Tue Jul 04, 2017 8:44 am

Physicists Ana Claudia Barbosa Aguiar and Peter Read of the University of Oxford in the United Kingdom wanted to see if they could recreate the hexagon in the lab. They placed a 30-liter cylinder of water on a slowly spinning table; the water represented Saturn’s atmosphere spinning with the planet’s rotation. Inside this tank, they placed a small ring that whirled more rapidly than the cylinder. This created a miniature artificial "jet stream" that the researchers tracked with a green dye.

(…)

“Most planetary scientists are not aware of how ubiquitous these sorts of patterns are in fluid dynamics.”- Saturn's Strange Hexagon Recreated in the Lab: Science


Paper: A laboratory model of Saturn’s North Polar Hexagon: Ana C. Barbosa Aguiar *, Peter L. Read, Robin D. Wordsworth, Tara Salter, Y. Hiro Yamazaki

Video: Saturn's Strange Hexagon Recreated in the Lab – ScienceNOW

Additional Paper:

We report a novel and spectacular instability of a fluid surface in a rotating system. In a flow driven by rotating the bottom plate of a partially filled, stationary cylindrical container, the shape of the free surface can spontaneously break the axial symmetry and assume the form of a polygon rotating rigidly with a speed different from that of the plate. With water we have observed polygons with up to 6 corners. It has been known for many years that such flows are prone to symmetry breaking, but apparently the polygonal surface shapes have never been observed. The creation of rotating internal waves in a similar setup was observed for much lower rotation rates, where the free surface remains essentially flat. We speculate that the instability is caused by the strong azimuthal shear due to the stationary walls and that it is triggered by minute wobbling of the rotating plate. The slight asymmetry induces a tendency for mode-locking between the plate and the polygon, where the polygon rotates by one corner for each complete rotation of the plate. – Polygons on a Rotating Fluid Surface Thomas R. N. Jansson et al


All of which begs the question: How does one get hexagonal-like craters on dry rocky bodies? Do dust particles 'electro-statically' adopt the fluid-like jet stream flow patterns?
"Our laws of force tend to be applied in the Newtonian sense in that for every action there is an equal reaction, and yet, in the real world, where many-body gravitational effects or electrodynamic actions prevail, we do not have every action paired with an equal reaction." — Harold Aspden
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Re: Saturn’s Hexagon "Recreated"

Unread postby Maol » Tue Jul 04, 2017 1:54 pm

H2O and hexagonal geometry could be the usual suspects.

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Re: Saturn’s Hexagon "Recreated"

Unread postby D_Archer » Wed Jul 05, 2017 5:06 am

Solar wrote:
Physicists Ana Claudia Barbosa Aguiar and Peter Read of the University of Oxford in the United Kingdom wanted to see if they could recreate the hexagon in the lab. They placed a 30-liter cylinder of water on a slowly spinning table; the water represented Saturn’s atmosphere spinning with the planet’s rotation. Inside this tank, they placed a small ring that whirled more rapidly than the cylinder. This created a miniature artificial "jet stream" that the researchers tracked with a green dye.

(…)

“Most planetary scientists are not aware of how ubiquitous these sorts of patterns are in fluid dynamics.”- Saturn's Strange Hexagon Recreated in the Lab: Science


Paper: A laboratory model of Saturn’s North Polar Hexagon: Ana C. Barbosa Aguiar *, Peter L. Read, Robin D. Wordsworth, Tara Salter, Y. Hiro Yamazaki

Video: Saturn's Strange Hexagon Recreated in the Lab – ScienceNOW

Additional Paper:

We report a novel and spectacular instability of a fluid surface in a rotating system. In a flow driven by rotating the bottom plate of a partially filled, stationary cylindrical container, the shape of the free surface can spontaneously break the axial symmetry and assume the form of a polygon rotating rigidly with a speed different from that of the plate. With water we have observed polygons with up to 6 corners. It has been known for many years that such flows are prone to symmetry breaking, but apparently the polygonal surface shapes have never been observed. The creation of rotating internal waves in a similar setup was observed for much lower rotation rates, where the free surface remains essentially flat. We speculate that the instability is caused by the strong azimuthal shear due to the stationary walls and that it is triggered by minute wobbling of the rotating plate. The slight asymmetry induces a tendency for mode-locking between the plate and the polygon, where the polygon rotates by one corner for each complete rotation of the plate. – Polygons on a Rotating Fluid Surface Thomas R. N. Jansson et al


All of which begs the question: How does one get hexagonal-like craters on dry rocky bodies? Do dust particles 'electro-statically' adopt the fluid-like jet stream flow patterns?



Fluid dynamics is a result not a cause.

The cause is incoming charge (ie photons and ions/electrons), the Birkeland current.

Because charge (ie photons) has chirality, left and right spins, these spins oppose and thus sheets are created of different spin, this sets up the cylinders sheets that spin in opposite directions and that causes the diocotron instabilities in the fluids and thus a shape forms, round, hexagon, square...

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Daniel
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