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 telescope, providing a new observational method for studying stellar magnetic activity and its origins [1] 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 [1] - This breakthrough allows for direct analysis of the small-scale magnetic field structure on stellar surfaces, enhancing the understanding of complex stellar magnetic fields [1] 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, capturing minute variations in stellar radio emissions [1] - Currently, there are very few devices worldwide that can match the capabilities of FAST in this regard [1]

寻找太阳系外类似地球的宜居行星一直是人类的梦想，行星宿主恒星的磁活动对行星是否宜居有重要影响。近日，以北京大学地球与空间科学学院田晖教授 和博士生张佳乐为主的研究团队利用"中国天眼"FAST（500米口径球面射电望远镜），首次探测到来自恒星黑子区域的毫秒级射电暴信号，为直接探测恒星 小尺度磁场、揭示恒星磁活动的起源提供了全新的观测手段。相关论文于北京时间10月18日发表于国际学术期刊《科学进展》。 太阳黑子是太阳表面局地的强磁场区域，其磁场结构的爆发会扰动地球周围的空间环境，影响卫星运行和通信、导航、电力等系统的正常工作。其实，其他 恒星也存在类似的黑子结构，一些活跃红矮星上的磁活动还会更加频繁剧烈。 长期以来，直接测量恒星黑子区磁场是困扰学术界的难题。主流恒星磁场测量方法通常只能获取恒星整体的大尺度磁场信息，难以分辨局地的小尺度结构； 传统的光学观测虽然能够揭示黑子的存在及其基本性质，但无法直接获得黑子区局部磁场强度与分布数据。 此次，在一颗名为AD Leo的活跃红矮星上，团队用FAST探测到一种极为特殊的射电暴，其信号频率变化速度高达每秒约8GHz，远超以往在类似恒星上观 测到的任何射电暴频率漂移速率。研 ...