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Previously understood that magnetic fields were directly related to rotation, so when I read that Mars, like Venus, didn't have one, my understanding crumbled. What exactly causes magnetic fields in planets? | Astronomy.com
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  • Previously understood that magnetic fields were directly related to rotation, so when I read that Mars, like Venus, didn't have one, my understanding crumbled. What exactly causes magnetic fields in planets?
FROM THE January 2016 ISSUE

Previously understood that magnetic fields were directly related to rotation, so when I read that Mars, like Venus, didn't have one, my understanding crumbled. What exactly causes magnetic fields in planets?

Kerry Dougan, Jarabacoa, Dominican Republic
Published: Monday, November 23, 2015
RELATED TOPICS: MAGNETIC FIELD
Mars InSight lander
Planetary magnetic fields are definitely related to rotation, but “directly” — not so much. They are actually generated by the complex interaction of fluid currents (motion of material) and electric currents (motion of electrons) in the conducting fluid of the molten metal core. This is called a “dynamo,” and core convection is its primary driver, powered by cooling and crystallization growth of the solid inner core.

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