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Physicists find clue to formation of magnetic fields around stars and galaxies

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  Physicists find clue to formation of magnetic fields around stars and galaxies Sam Wormley <swormley1@gmail.com> - 2015-11-10 09:46 -0600
    Re: Physicists find clue to formation of magnetic fields around stars and galaxies jimp@specsol.spam.sux.com - 2015-11-10 18:26 +0000
    Re: Physicists find clue to formation of magnetic fields around stars and galaxies "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-10 13:14 -0800

#531784 — Physicists find clue to formation of magnetic fields around stars and galaxies

Physicists find clue to formation of magnetic fields around stars and 
galaxies
> http://phys.org/news/2015-11-physicists-clue-formation-magnetic-fields.html


> An enduring astronomical mystery is how stars and galaxies acquire
> their magnetic fields. Physicists Jonathan Squire and Amitava
> Bhattacharjee at the U.S. Department of Energy's (DOE) Princeton
> Plasma Physics Laboratory (PPPL) have found a clue to the answer in
> the collective behavior of small magnetic disturbances. In a paper
> published in October in Physical Review Letters, the scientists
> report that small magnetic perturbations can combine to form
> large-scale magnetic fields just like those found throughout the
> universe. This research was funded by the DOE Office of Science.

> In the paper, Squire and Bhattacharjee show that under certain
> conditions small magnetic fields—instead of small velocity fields,
> which have been studied more often—can combine to form one large
> field. After running computer simulations on a PPPL computer named
> "Dawson," the scientists found that small disturbances can combine to
> form one large disturbance when there is a lot of velocity shear—when
> two areas of a fluid are moving at different speeds. "We used a
> variety of computational and analytic methods to approach the problem
> from a few different angles," said Squire.


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#531828

Sam Wormley <swormley1@gmail.com> wrote:
> Physicists find clue to formation of magnetic fields around stars and 
> galaxies
>> http://phys.org/news/2015-11-physicists-clue-formation-magnetic-fields.html
> 
> 
>> An enduring astronomical mystery is how stars and galaxies acquire
>> their magnetic fields. Physicists Jonathan Squire and Amitava
>> Bhattacharjee at the U.S. Department of Energy's (DOE) Princeton
>> Plasma Physics Laboratory (PPPL) have found a clue to the answer in
>> the collective behavior of small magnetic disturbances. In a paper
>> published in October in Physical Review Letters, the scientists
>> report that small magnetic perturbations can combine to form
>> large-scale magnetic fields just like those found throughout the
>> universe. This research was funded by the DOE Office of Science.
> 
>> In the paper, Squire and Bhattacharjee show that under certain
>> conditions small magnetic fields?instead of small velocity fields,
>> which have been studied more often?can combine to form one large
>> field. After running computer simulations on a PPPL computer named
>> "Dawson," the scientists found that small disturbances can combine to
>> form one large disturbance when there is a lot of velocity shear?when
>> two areas of a fluid are moving at different speeds. "We used a
>> variety of computational and analytic methods to approach the problem
>> from a few different angles," said Squire.
 
Implying they were clueless before.
 

-- 
Jim Pennino

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#531883

On Tuesday, November 10, 2015 at 7:46:53 AM UTC-8, Sam Wormley wrote:
> Physicists find clue to formation of magnetic fields around stars and 
> galaxies
> > http://phys.org/news/2015-11-physicists-clue-formation-magnetic-fields.html
> 
> 
> > An enduring astronomical mystery is how stars and galaxies acquire
> > their magnetic fields. Physicists Jonathan Squire and Amitava
> > Bhattacharjee at the U.S. Department of Energy's (DOE) Princeton
> > Plasma Physics Laboratory (PPPL) have found a clue to the answer in
> > the collective behavior of small magnetic disturbances. In a paper
> > published in October in Physical Review Letters, the scientists
> > report that small magnetic perturbations can combine to form
> > large-scale magnetic fields just like those found throughout the
> > universe. This research was funded by the DOE Office of Science.
> 
> > In the paper, Squire and Bhattacharjee show that under certain
> > conditions small magnetic fields--instead of small velocity fields,
> > which have been studied more often--can combine to form one large
> > field. After running computer simulations on a PPPL computer named
> > "Dawson," the scientists found that small disturbances can combine to
> > form one large disturbance when there is a lot of velocity shear--when
> > two areas of a fluid are moving at different speeds. "We used a
> > variety of computational and analytic methods to approach the problem
> > from a few different angles," said Squire.
> 
> 
> -- 
> 
> sci.physics is an unmoderated newsgroup dedicated
> to the discussion of physics, news from the physics
> community, and physics-related social issues.

Is 99% of the universe's electricity DC?  TreBert

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