Discovery of Rapid Magnetic Waves
The Sun’s surface is threaded by a tangled web of magnetic fields that become especially structured in the polar coronal holes. These regions are considered the source of the fast solar wind, which propels particles to speeds of several hundred kilometres per second into interplanetary space. Until now, the exact mechanism that gives these particles their extra push has remained unclear.
Measurements by Solar Orbiter
An international team led by Yuhang Gao and Hui Tian from Peking University used the high‑resolution instruments aboard ESA’s Solar Orbiter to search for rapid magnetic oscillations in those areas. The scientists detected high‑frequency waves that had not been directly observed before, oscillating in the range of several hertz.
Possible Acceleration Mechanism
The newly identified waves could transfer energy from the Sun’s magnetic field to charged particles, providing the kick needed to reach the observed speeds of the fast solar wind. The findings suggest that such waves may be a missing piece in models of solar wind acceleration.
Outlook
Further observations with Solar Orbiter and complementary missions will aim to characterise the properties of these waves in detail and clarify their role within the heliosphere. The study was published in the journal National Science Review and offers new insights into solar magnetic dynamics.