Beneath the bogs of New Zealand’s Northland is a massive Ngāwhā kauri, living from 41,000 to 42,500 years ago, which gives an isolated, unbroken record of a period when Earth’s magnetic field declined ...

Earth’s magnetic field has correlated with fluctuations in atmospheric oxygen, according to a newly released study.

This is the geodynamo. The Moon, too, might have had a similar dynamo, but 50 times weaker, given how much smaller it is compared to Earth.

As the fluid dynamics of the core change, the magnetic pole shifts over time in a process known as the geodynamo. Now, something unusual seems to be happening.

These currents create the magnetic field in a process known as the geodynamo. Read Also: Ursid Meteor Shower 2024 Date and Time in India: How to Watch Year's Final Meteor Show ...

The updated version of the World Magnetic Model was released on Dec. 17, with a new prediction of how the magnetic north pole will shift over the next five years. Here's why it was changed.

It is generated by the geodynamo effect. "We know that the Earth's core is primarily composed of iron," explains Attila Cangi, Head of the Machine Learning for Materials Design department at CASUS.

For example, around 3.9 billion years ago, Mars' geodynamo mysteriously slowed down, dramatically weakening its magnetic field, which eventually resulted in the loss of its atmosphere.

Mars' global magnetic field may have hung around for 200 million years longer than scientists had thought, possibly giving life a longer window to take hold on the Red Planet.

A planetary magnetic field is produced by a geodynamo effect deep inside a planet. A planet like Earth has an iron-nickel core that comes in two parts, a solid inner core and a molten outer core.

Without this geodynamo, NASA says, Earth’s biosphere would not exist as it does today because life would be exposed to damaging levels of radiation from the sun and space.