Topic: Space

Scientists at University of Wisconsin-Madison used supercomputer simulations to study plasma flows and discovered how large magnetic fields form. This breakthrough could help us better understand space weather near Earth and even galaxy formation.

Magnetic fields are all around us, from planets to galaxies. These invisible forces shape major cosmic events and processes. For a long time, scientists struggled to explain how small magnetic fields become large-scale structures. Now, researchers think they have found the answer.

The team used supercomputer simulations to study plasma flows. They found that large magnetic fields can emerge when turbulent plasma develops organized jet-like flows. This discovery introduces a new explanation for how cosmic magnetic fields form.

Lead author Bindesh Tripathi explained: 'Magnetic fields across the cosmos are large-scale and ordered, but our understanding of how these fields are generated is that they come from some kind of turbulent motion.' The team wanted to know how this turbulence creates such large-scale fields.

To tackle this challenge, the researchers changed two important aspects of previous studies. They added a constantly renewed velocity gradient into the simulations. This occurs when different parts of a system move at different speeds. For example, a cyclist who suddenly hits a curb experiences a sharp velocity gradient when the bike stops but the rider's momentum continues forward.

The team also used massive supercomputer simulations to study magnetic fields interacting with unstable velocity gradients. Their model used 137 billion grid points in 3D space. In total, they performed roughly 90 simulations, producing 0.25 petabytes of data and consuming nearly 100 million CPU hours on Purdue University's Anvil supercomputer.

When the researchers repeated the simulations without maintaining the large-scale velocity gradient, the organized magnetic structures never formed. Instead, the system remained chaotic and disordered.

The discovery could help scientists better understand everything from black hole formation to space weather near Earth.

Why It Matters

This breakthrough can help us better understand space weather that affects our planet. It's crucial for predicting solar storms and protecting our technology infrastructure.

Key Facts

• Scientists at University of Wisconsin-Madison used supercomputer simulations to study plasma flows and discovered how large magnetic fields form.
• Large magnetic fields can emerge when turbulent plasma develops organized jet-like flows.
• The team's discovery introduces a new explanation for how cosmic magnetic fields form.
• The researchers used massive supercomputer simulations with 137 billion grid points in 3D space.
• The study was published in the journal Nature on January 21, 2026.

Key Terms

Turbulent motion

Unpredictable and chaotic movement of particles

Implications

This breakthrough can help us better understand space weather that affects our planet. It's crucial for predicting solar storms and protecting our technology infrastructure.