Czech scientists identify solar coronal hole via eclipse imagery

Researchers from Brno University of Technology have identified a coronal hole in the Sun's corona using unique imagery captured during a recent solar eclipse. A coronal hole is a region where the Sun's magnetic field lines do not loop back to the surface but instead open into interplanetary space, allowing extremely fast solar wind—a stream of electrically charged particles—to escape.

Lead researcher Miloslav Druckmüller explains that if these particle streams reach Earth, they can significantly impact the planet's magnetic field. This geomagnetic activity can manifest as auroras visible at lower latitudes or, in more intense cases, disrupt critical technologies such as radio communications, satellites, and navigation systems.

In addition to the coronal hole, the team observed delicate vortex structures resembling ‘smoke rings,’ which are caused by instabilities in the hot plasma of the corona. The findings, captured during a phase of the solar cycle following its peak, will provide essential data for ongoing astrophysical research at the University of Hawaii.