Rising from the sun’s surface like bulbous, fiery plumes, coronal mass ejections are bursts of magnetic energy from the sun’s corona. Often, these outbursts manifest as magnetic flux ropes, large and arching structures that either end in collapse or erupt outwards into surrounding space, throwing out millions of tons of plasma and radiation.
They’re considered an unpredictable threat to Earth technology and space missions.
Researchers from the U.S. Dept. of Energy’s Princeton Plasma Physics Laboratory (PPPL) have identified a mechanism that may indicate the halt of such an eruption. The research was published in Nature.
During laboratory experiments, the researchers discovered that when the guide magnetic field—which runs along the flux rope—is strong enough to keep the rope from destabilizing, it ends up collapsing rather than erupting.

