Permanent magnets may shield astronauts from solar storms, study finds

Permanent magnets could provide a new method for protecting astronauts from harmful solar storms, according to a study published on July 11, 2026, by Valerio Parisi and a team of researchers from Italy and Germany. The research explores the feasibility of using permanent magnets to block radiation in deep-space missions, a significant concern for astronaut safety.

Understanding the Radiation Threats in Space

Astronauts on deep-space missions face severe risks from radiation, primarily from two sources: galactic cosmic rays (GCR) and solar particle events (SPE). GCRs are continuous and can penetrate materials easily, while SPEs are bursts of protons from solar storms that can be devastating to biological systems.

Current protective measures include passive water shells and active superconducting magnets, but both have significant drawbacks. For instance, water is effective but heavy, making it costly to launch into space. Superconducting magnets offer strong protection but require constant power and cooling, risking total failure if interrupted.

Potential of Permanent Magnets for Spacecraft Shielding

The authors propose a middle-ground solution using permanent magnets, which are lighter and do not require power to operate. Their study demonstrated that an array of 1,482 neodymium-iron-boron (NdFeB) permanent magnets could deflect about 20% of incoming solar particles in the energy range of 0.1 to 10 MeV.

This array, measuring 3 x 3 x 3 centimeters each and weighing less than 300 kilograms (661 pounds), showed potential as a radiation shield. However, it primarily deflected lower-energy particles, acting as a “high pass” filter, while not offering protection against chaotic GCRs.

Challenges and Future Research Directions

Despite the promising results, several challenges remain. The directional nature of the magnetic field limits its effectiveness against GCRs, which come from all directions. Additionally, interactions between protons and the magnets could produce secondary radiation, potentially increasing localized radiation exposure for astronauts.

Furthermore, the long-term durability of the permanent magnets is a concern, as they can demagnetize over time, reducing their protective capabilities. To address these issues, the team plans advanced Monte Carlo simulations to evaluate the magnets' effectiveness in chaotic environments.

In conclusion, while permanent magnets may not offer complete protection, they represent a valuable component in a hybrid approach to radiation mitigation for future deep-space missions.