Parker Solar Probe Detects Charged Dust in Sun’s Corona

NASA’s Parker Solar Probe has detected charged dust grains being transported by magnetic plasma waves in the Sun’s outer atmosphere, offering a fresh insight into the long‑standing puzzle of why the solar corona reaches temperatures of millions of degrees. The probe’s instruments, which have been orbiting closer to the Sun than any previous spacecraft, recorded tiny, ionized particles drifting along the twisted magnetic field lines that permeate the corona.

These observations suggest that dust grains, once ionized by intense solar radiation, can become entrained in the turbulent plasma flows that carry energy outward from the Sun’s surface. By acting as carriers of charge and momentum, the grains may help dissipate magnetic energy into heat, thereby contributing to the extreme temperatures observed in the corona. The finding adds a new piece to the complex mechanism that converts magnetic and kinetic energy into thermal energy in the Sun’s outer layers.

The Parker Solar Probe’s discovery underscores the importance of in‑situ measurements for unraveling solar physics. As the probe continues to make close passes, scientists expect further data that will refine models of coronal heating and improve our understanding of space weather phenomena that affect Earth and the broader heliosphere.