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].

据央视新闻，记者昨日从北京大学地球与空间科学学院获悉， 近日该学院研究团队利用"中国天眼" （500米口径球面射电望远镜FAST）， 探测 到一种新的来源于恒星黑子区域磁场的毫秒级射电暴。该成果填补了我们对太阳系外恒星小尺度磁场认知的空白， 对于推动太阳系外的空间天气 研究有重要意义。相关成果近日在国际学术期刊《科学进展》发表。 本次观测结果示意图，右上方为观测到的射电频谱的一部分。 太阳磁场是驱动太阳活动的根源，这些磁活动通常源自太阳上局地的强磁场区域，如太阳黑子区域。在其他晚型恒星上，也存在着类似的磁 活动现象，一些恒星（如活跃的M型恒星）上的磁活动比太阳上的更加剧烈、频繁，对近邻行星的宜居性有着显著影响。 测量恒星小尺度磁场是探究恒星磁活动起源、评估其潜在空间天气效应的关键。但长期以来，主流的恒星磁场测量方法（如塞曼多普勒成 像）基本只能提供恒星全球性的大尺度磁场信息，无法分辨恒星黑子区域的小尺度磁场结构。 "中国天眼"的高灵敏度射电观测为黑子探测和研究提供了一种全新的、与光学手段互补的途径。 科研团队通过探测恒星黑子上方局地磁场结构发 出的射电信号，可以约束黑子的尺度，了解其上方星冕磁场的强度和结构， ...

田晖告诉科技日报记者，该研究取得成功的关键在于FAST的高灵敏度和高分辨率。过去恒星射电观测 时间分辨率大多只有小时或分钟量级，而FAST把观测时间分辨率提升到了"亚毫秒"级，能捕捉恒星射 电辐射的细微瞬变，目前世界上几乎没有其他设备能与之媲美。 （科技日报） 图为本次观测结果示意图，右上方为观测到的射电频谱。受访者供图 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》。 长期以来，直接测量恒星黑子区磁场是困扰学术界的难题。该发现说明恒星黑子区域的磁活动能将电子 加速到极高能量，这些电子在磁场中做回旋运动，产生独特的射电辐射。捕捉这些射电信号，就可以直 接分析恒星表面小尺度的磁场结构。它为研究恒星磁活动的起源、理解恒星复杂的磁场结构提供了全新 方法。 ...

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].

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 ...