Earth's magnetic field

Quick Facts: Who was Earth's magnetic field?

Subject:

Earth's magnetic field

Known for:

The magnetic field generated by convection currents in Earth's outer core.

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2Day Chrono-Wiki & Primary Historical Archives

Origins & Early Life

Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun. The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in Earth's outer core: these convection currents are caused by heat escaping from the core, a natural process called a geodynamo.

Career & Major Achievements

The magnitude of Earth's magnetic field varies over its surface and changes with time. In a 2019 survey it ranged around 30,000 to 60,000 nT (0.30 to 0.60 G).

Enduring Legacy & Impact

As an approximation, it is represented by a field of a magnetic dipole currently tilted at an angle of about 11° with respect to Earth's rotational axis, as if there were an enormous bar magnet placed at that angle through the center of Earth.

Chronological Milestones & Life Events

1. 2019: 2019 Milestone — In a 2019 survey it ranged around 30,000 to 60,000 nT (0.

Notable Quotes by Earth's magnetic field

“The magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in Earth's outer core.”

Historical Fact-Check Quiz: Earth's magnetic field

True or False: “The Earth's magnetic field is generated by electric currents resulting from the motion of convection currents in the molten iron and nickel of the outer core.”

Answer (TRUE ⭕): The geodynamo process, driven by heat escaping the core, creates the necessary convection currents in the outer core, which in turn generate the planet's magnetic field.

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Frequently Asked Questions about Earth's magnetic field