Earth’s magnetic field is the vector field generated primarily by dynamo action in the liquid outer core, where convective motion of electrically conducting iron alloys induces and sustains a predominantly dipolar geomagnetic field. It extends from the core through the mantle and crust into space, forming the magnetosphere via interaction with the solar wind. The field is characterized by its intensity, inclination, and declination, and exhibits secular variation, westward drift, and polarity reversals on geological timescales. It governs charged particle dynamics in near-Earth space, shapes radiation belts, and constrains models of core dynamics and planetary evolution.
Earth's magnetic field acts as a vital shield against radiation arriving from space, but it is not constant. A new international study has examined how a reduction of the magnetic field similar to the Laschamps excursion ...
Earth Sciences
Mar 25, 2026
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The history of Earth is written on the great tablets of tectonic plates. The motions of plates shaped land masses, formed oceans, and created the varied climates and habitats that set the stage for evolution and the diversity ...
Earth Sciences
Mar 19, 2026
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It seems improbable that a satellite designed to monitor polar ice sheets and floating sea ice could accurately measure a disturbance in Earth's magnetic field. But that is just what ESA's CryoSat mission did earlier this ...
Planetary Sciences
Mar 16, 2026
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Nocturnal insects may use both Earth's magnetic field and visual cues to guide their migratory flight behaviors, according to recent findings. The research, published in eLife, presents compelling evidence on how geomagnetic ...
Plants & Animals
Mar 3, 2026
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Every winter, thousands of tourists travel to high-latitude regions like Scandinavia, Canada, and Alaska hoping to see the Aurora Borealis or Northern Lights. Vincent Ledvina, an aurora guide and Ph.D. student in space physics ...
Astronomy
Feb 24, 2026
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Several studies have predicted that not all geomagnetic reversals have been discovered, but it was unknown in which periods they might be hidden. Researchers led by the National Institute of Polar Research used a statistical ...
Earth Sciences
Feb 23, 2026
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A stream of charged particles known as the solar wind flows from the sun toward Earth. Here, it meets Earth's magnetic fields, which shield our planet like a giant umbrella. The Space Umbrella project needs your help investigating ...
Planetary Sciences
Feb 20, 2026
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Some bacterial species possess an astonishing ability: They use Earth's magnetic field to orient themselves. To better understand this mechanism, the team led by Argovia-Professor Martino Poggio from the Swiss Nanoscience ...
Bio & Medicine
Feb 17, 2026
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101
Earth's magnetic field is generated by the churn of its liquid nickel-iron outer core, but it is not a constant feature. Every so often, the magnetic north and south poles swap places in what are called geomagnetic reversals, ...
Planetary Sciences
Feb 5, 2026
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186
Exploring Earth's deep interior is a far bigger challenge than exploring the solar system. While we have traveled 25 billion km into space, the deepest we have ever gone below our feet is just over 12 km. Consequently, little ...
Planetary Sciences
Feb 3, 2026
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