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New research suggests that Earth’s magnetic field could be produced by ocean currents rather than molten metals swirling around its core as was previously thought.
The controversial new claims, published this week, suggest that the movements of volumes of salt water around the world have been seriously underestimated by scientists as a source of magnetism.
The research could revolutionise geophysics, the study of the Earth’s physical properties and behaviour, in which the idea that magnetism originates in a molten core is a central tenet.
Originally posted by Chadwickus
reply to post by oozyism
Mercury, Jupiter, Saturn, Uranus, and Neptune all have a magnetic field.
(They also don't have oceans)
Jupiter is a gas giant planet, as such, it doesn't have a clearly defined surface like the terrestrial planets have, but rather it becomes progressively denser moving from the outside in. If you could get down to the center of Jupiter, you would find a mixture of nickel and iron floating in a soup of liquid hydrogen.
Let's be clear, however, that scientists don't know for sure what the core of Jupiter is made of. They can make educated guesses based on taking gravitational measurements and comparing them with Earth. The core of Jupiter is thought to represent between 3% and 15% of its total mass. Another way scientists can assume the existence of a core is by knowing how planets form. A rocky or icy core large enough, can steal hydrogen and helium from a nebula, wrapping these gases around it like spinning cotton candy. Between the core and what we see as the surface is a thick layer of liquid hydrogen.
Originally posted by oozyism
reply to post by JohnPhoenix
They claim the moon had magnetic field in the past, not now. I think, I just read about it and still reading.
And I'm talking about earth moon.
The external magnetic field of the Moon is very weak in comparison to that of the Earth. Other major differences are that the Moon does not currently have a dipolar magnetic field (as would be generated by a geodynamo in its core) and the varying magnetization that is present is almost entirely crustal in origin. One hypothesis holds that the crustal magnetizations were acquired early in lunar history when a geodynamo was still operating. The small size of the lunar core, however, is a potential obstacle to this theory. Alternatively, it is possible that on an airless body such as the Moon, transient magnetic fields could be generated during large impact events. In support of this, it has been noted that the largest crustal magnetizations appear to be located near the antipodes of the giant impact basins. It has been proposed that such a phenomenon could result from the free expansion of an impact-generated plasma cloud around the Moon in the presence of an ambient magnetic field.
Secular variation of the Earth's main magnetic field is believed to originate in the Earth's core. (The main field is operationally defined as comprising spherical harmonics of degree l≤10.) I propose a different mechanism of secular variation: ocean water being a conductor of electricity, the magnetic field induced by the ocean as it flows through the Earth's main field may depend on time and manifest itself globally as secular variation.
There is little doubt that these conclusions will be met with skepticism. And so they should: the results presented by no means constitute a proof. But the possibility of direct connection between the ocean flow and the secular variation of the geomagnetic field is bound to stimulate further research, especially in view of the implications for the question of the origin of the main field.
Were you ever on the edge of sleep and time seem to slow down? Was this a relativistic observation, being that your mind was influenced by your perception, or did your mind actually travel FASTER than your perceived observational data?
Originally posted by oozyismInteresting point, but based on what you are saying:
(They also don't have hot molten lava in them).