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Freeman Dyson
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Venus currently does not have a magnetic field. I have come across one source that says the rotation plays a part in this, and another source that says that is a misconception.
http://hyperphysics.phy-astr.gsu.edu/HBASE/magnetic/magearth.html"
and then
http://dawn.ucla.edu/personnel/russell/papers/venus_mag/"
Anyone clear this up? thanks.
Although the details of the dynamo effect are not known in detail, the rotation of the Earth plays a part in generating the currents which are presumed to be the source of the magnetic field. Mariner 2 found that Venus does not have such a magnetic field although its core iron content must be similar to that of the Earth. Venus's rotation period of 243 Earth days is just too slow to produce the dynamo effect.
http://hyperphysics.phy-astr.gsu.edu/HBASE/magnetic/magearth.html"
and then
. It is important to note that, contrary to popular belief, dynamo theory does not credit the smallness of the magnetic moment to the slow rotation of Venus (a Venus day of ~ 243 Earth days is almost equal to the length of its year of ~ 224 days, and its sense of rotation is retrograde)
http://dawn.ucla.edu/personnel/russell/papers/venus_mag/"
Anyone clear this up? thanks.
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