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magnetic fields & magnetism

An artist’s depiction of four purple octagonal spacecraft flying in space. The light behind them is orange from the Sun, and in the background at right is Earth, surrounded by an overlapping series of magnetic field lines.
Posted inResearch Spotlights

Magnetic “Switchback” Detected near Earth for First Time

Sarah Stanley, Science Writer by Sarah Stanley 8 October 20258 October 2025

Until recently, this type of zigzag shape—formed by energetic rearrangement of magnetic field lines—had been seen only near the Sun.

Cutaway diagram of seismographic waves passing through the interior of Mars, with a metal core at center
Posted inNews

Scientists May Have Finally Detected a Solid Inner Core on Mars

Javier Barbuzano, Science Writer by Javier Barbuzano 1 October 20251 October 2025

Seismic clues from NASA’s InSight mission suggest that Mars hides a solid inner core, and raise new questions about why the planet’s magnetic field disappeared.

A rocket launches in front of a clear sky
Posted inResearch & Developments

Trio of Space Weather Satellites Take Flight

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 24 September 202524 September 2025

These three satellites will that study the solar wind and its impacts.

An illustration of an orange-yellow star releasing a massive flare and stellar material along a magnetic loop that connects with a nearby red planet that is outgassing its atmosphere.
Posted inNews

Exoplanet Triggers Stellar Flares and Hastens Its Demise

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 5 August 20255 August 2025

HIP 67522 b can’t stop blasting itself in the face with stellar flares, a type of magnetic interaction that scientists have spent decades looking for.

An artist’s depiction of Jupiter and its magnetosphere, which appears to stretch out to the left and right of the planet like two purple butterfly wings
Posted inResearch Spotlights

A Solar Wind Squeeze May Have Strengthened Jovian Aurorae

Sarah Stanley, Science Writer by Sarah Stanley 1 August 20251 August 2025

Juno spacecraft data suggest an extreme compression of the planet’s magnetosphere in December 2022, caused by the solar wind, briefly brightened the ultraviolet light displays.

Map from the study.
Posted inEditors' Highlights

300 Million Years of Polar Wander: Slowly but Surely

by Thorsten W. Becker 16 April 202516 April 2025

A reanalysis of paleomagnetic poles provides tighter bounds on the style and rate of motions of our whole planet with respect to its rotation axis.

Four seemingly identical, octagonal, disklike structures, each with several various thin antennas extending outward at various angles, appear to be floating in a closely spaced cluster in space. In the background, on the right side of the image, is the round shape of the planet Earth, encircled by translucent, overlapping blue and purple lines.
Posted inResearch Spotlights

New Insights into an Enigmatic Form of Magnetic Reconnection

Sarah Stanley, Science Writer by Sarah Stanley 11 April 202511 April 2025

A new study deepens understanding of magnetic field behavior recently discovered by NASA in Earth’s magnetosphere.

A two-panel horizontal image. On the left is Neptune observed by the Hubble Space Telescope. It is a blue circle, tilted about 25° to the left. There are white smudges at 7 o’clock and just above 5 o’clock. At right is an opposing view of the planet, using data from Hubble and JWST. It is a multihued blue orb. There are white smudges in the same spots as the image on the left but also at the center of the planet and at the top. There are cyan smudges vertically along the right side, and the top of these areas is more translucent than the bottom.
Posted inNews

After 30-Year Search, Scientists Finally Find an Aurora on Neptune

Kimberly M. S. Cartier, News Writing and Production Intern for Eos.org by Kimberly M. S. Cartier 10 April 202510 April 2025

The planet’s elusive aurorae are much colder than expected, which is how they evaded detection for so long.

Diagram from the study.
Posted inEditors' Highlights

Fast Flows in Earth’s Magnetotail Surveyed by NASA Satellites

by Mary Hudson 9 April 20253 April 2025

A survey of high-speed electron flow observed by NASA satellites in the Earth’s magnetotail is presented and related to the process of magnetic field line reconnection and particle acceleration.

Photo of a rock outcrop.
Posted inEditors' Highlights

Remagnetization Illuminates Tectonic Consolidation of Megacontinents

by Agnes Kontny 31 March 202527 March 2025

New rock and paleomagnetic research give evidence for prolonged heating during the Cambrian-Ordovician tectonic consolidation of West Gondwanaland.

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Features from AGU Publications

Research Spotlights

A Step Toward AI Modeling of the Whole Earth System

9 October 20259 October 2025
Editors' Highlights

New Evidence for a Wobbly Venus?

29 September 202525 September 2025
Editors' Vox

All Publish, No Perish: Three Months on the Other Side of Publishing

29 September 202525 September 2025
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