Core Viewpoint - The research team from Peking University has detected a new type of millisecond radio burst originating from the magnetic field of stellar sunspot regions using the "China Sky Eye" (FAST), filling a gap in understanding small-scale magnetic fields of exoplanetary stars and significantly contributing to the study of space weather beyond the solar system [1][2]. Group 1 - The solar magnetic field drives solar activity, which typically originates from localized strong magnetic field regions such as sunspots [1]. - Similar magnetic activity phenomena exist on other late-type stars, with some stars (like active M-type stars) exhibiting more intense and frequent magnetic activities than the Sun, significantly affecting the habitability of nearby planets [1]. - Traditional methods for measuring stellar magnetic fields have primarily provided large-scale global magnetic field information, lacking the ability to discern small-scale magnetic structures in stellar sunspot regions [1]. Group 2 - The high sensitivity radio observations from "China Sky Eye" offer a new complementary approach to optical methods for detecting and studying sunspots [1]. - By detecting radio signals emitted from the localized magnetic field structures above stellar sunspots, the research team can constrain the size of the sunspots and understand the strength and structure of the coronal magnetic field above them, accurately characterizing the properties of stellar sunspots [1]. - The research team is also utilizing FAST to explore young solar-type stars, brown dwarfs, and stellar-planet interaction processes, which will further expand understanding of stellar magnetic activities and their driven exoplanetary space weather phenomena, providing important insights for the search for habitable exoplanets [2].

Core Insights - A research team led by Professor Tian Hui from Peking University has successfully detected millisecond-level radio burst signals from stellar sunspot regions using the FAST (Five-hundred-meter Aperture Spherical Telescope) [2] - This discovery provides a new observational method for directly measuring the small-scale magnetic fields of stars and revealing the origins of stellar magnetic activity [2] Group 1: Research Findings - The detection of radio signals indicates that magnetic activity in stellar sunspot regions can accelerate electrons to extremely high energies, which then produce unique radio emissions as they spiral in the magnetic field [2] - Capturing these radio signals allows for direct analysis of the small-scale magnetic field structures on stellar surfaces, offering insights into the origins of stellar magnetic activity and the complex magnetic field structures of stars [2] Group 2: Technological Advancements - The success of this research is attributed to the high sensitivity and high resolution of the FAST telescope, which has improved the time resolution of stellar radio observations to the "sub-millisecond" level [2] - This advancement enables the capture of subtle variations in stellar radio emissions, making FAST one of the few devices in the world capable of such detailed observations [2]

Core Viewpoint - The research team led by Professor Tian Hui from Peking University has successfully detected millisecond-level radio burst signals from stellar sunspot regions using the FAST telescope, providing a new observational method for studying stellar magnetic activity and its origins [2]. Group 1: Research Findings - The detection of radio signals indicates that magnetic activity in stellar sunspot regions can accelerate electrons to high energies, which then produce unique radio emissions as they spiral in the magnetic field [2]. - This breakthrough allows for direct analysis of the small-scale magnetic field structure on stellar surfaces, enhancing the understanding of complex stellar magnetic fields [2]. Group 2: Technological Advancements - The success of this research is attributed to the high sensitivity and resolution of the FAST telescope, which has improved the time resolution of stellar radio observations to the "sub-millisecond" level, enabling the capture of minute variations in stellar radio emissions [3]. - Currently, there are very few devices worldwide that can match the capabilities of FAST in this regard [3].