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Originally Posted by xelasnave
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Thanks Alex,
We should all keep in mind that these large magnetic structures are MANY times larger than the celestial bodies they interact with.
Also, magnetic fields can ONLY be formed from electric currents. There is a massive amount of electrical current flowing between these bodies.
Carl is correct, similar Birkeland currents have been found between Saturn and Jupiter and their moons.
The Birkeland Current was named after Kristian Birkeland, who both discovered that the Aurora was powered by giant electrical currents from the Sun, by conducting a Polar expedition, setting up measuring stations, and almost dieing in the process. He then returned to build a model of this, and experimentally verified the behavior in a lab.
Birkeland and his teralla experiment:
http://www.aldebaran.cz/actions/2002.../birkeland.jpg
Some more birkeland currents:
http://www.google.com.au/images?q=birkeland+current
It should be noted at the time, the British mathematician
Sydney Chapman, from his desk, unleashed a violent attack on Birkelands theories formed from his expedition and lab experiment, even attacking him well after his death.
THEN: We launched space satellites equipped with Langmuir probes, to actually measure these electrical currents... monster currents.
Birkeland was again verified, and now appears famously on overseas currency.
In the face of mathematical certainty he was a pioneer of empirics, that we still benefit from today.
It's funny that todays astronomers still give "Birkeland Currents" wild names from: Space tornados, rubber bands, flux tubes. I think this is just good old marketing, or just denial of the only thing that can cause a magnetic field to form. Electrical current.
http://www.thunderbolts.info/tpod/20...29currents.jpg
Next time you receive an astronomer louding preach 'rubber band flux tube', you'll be well equipped for a revealing question of Birkeland Current history, which forms common knowledge amongst some radio astronomers and plasma cosmologists. It's easy. It's just current down a wire, like those in your house, and like the fluro tubes in the ceiling.