01/21/2026
Researchers using NASA’s Magnetospheric Multiscale (MMS) mission have observed a magnetic switchback—previously seen only in the Sun’s atmosphere—right in Earth’s outer magnetosphere. Switchbacks form when magnetic field lines break and reconnect, creating sharp zigzag shapes.
The MMS satellites recorded solar wind plasma colliding with Earth’s magnetic field, producing a twisting disturbance. Some charged particles penetrated the magnetosphere, causing field lines to snap into a switchback configuration before returning to their original state. This local event mirrors similar solar phenomena observed millions of kilometers away by the Parker Solar Probe.
This discovery suggests switchbacks can occur wherever solar wind meets planetary magnetic fields. Studying these local events may improve understanding of magnetic reconnection, space plasma dynamics, geomagnetic storms, and auroras offering new insights into space weather right in our cosmic backyard.
Source / Credit: E. O. McDougall et al., Journal of Geophysical Research: Space Physics (2025)