New method tests magnet-powered braking for safer, more reusable spacecraft reentry

Researchers at Tokyo Metropolitan University have developed a new experimental platform to evaluate magnetohydrodynamic (MHD) aerobraking for spacecraft reentry. The system employs a powerful electromagnet to generate intense magnetic fields, enabling a miniature vessel to be subjected to a shock wave traveling at speeds exceeding seven kilometres per second (4.3 miles per second). This approach allows scientists to observe how a plasma‑filled atmosphere interacts with a strong magnetic field in a controlled laboratory setting.

Unlike earlier studies that relied on permanent magnets, the university’s electromagnet produces magnetic fields far stronger than previously achieved, providing a more realistic representation of the forces a spacecraft would encounter during atmospheric entry. By incrementally increasing the field strength and shock‑wave velocity, the team aims to refine the MHD aerobraking technique, which could reduce aerodynamic heating and structural stress on reentering vehicles.

The breakthrough represents a critical step toward full‑scale atmospheric tests with actual spacecraft. If successful, MHD aerobraking could offer a passive, energy‑efficient method for decelerating and protecting spacecraft during reentry, potentially improving safety and reducing the need for traditional heat‑shield materials.