NSF-CGP Fellowship: Studies of the Solar Corona Using Simultaneous X-ray and Radio Observations

9722489 Kundu该奖项提供资金支持马里兰大学帕克分校天文学系Mukul R. Kundu博士与日本三高国家天文台中仓太阳观测站Takashi Sakurai博士合作进行为期三个月的研究访问。他们的研究涉及研究太阳日冕和太阳耀斑，同时使用从日本太空任务Yohkoh和地面射电望远镜获得的x射线和无线电数据，特别是日本的Nobeyama射电日像仪。本研究包括三个具体项目，涵盖了广泛的日冕现象：(1)研究与SXT发现的日冕x射线喷流相关的无线电发射（软x射线增亮，起源于低日冕，然后沿着磁环传播），使用低频和高频无线电数据；(2)从耀斑生产力的角度研究活动区的演化；(3)观测太阳黑子本影上方的x射线辐射，以确定太阳黑子正上方日冕的性质；这将与同一地点上方磁场的无线电数据相结合。Kundu博士利用无线电和x射线成像数据对太阳日冕的知识做出了开创性的贡献。樱井博士将运用他的理论专长，从磁能储存和触发机制的角度研究太阳活动区和耀斑问题。他们互补的专业知识有望成为他们合作研究的资产。该项目将为美国科学家提供世界上其他地方无法获得的独特资源，用于研究太阳的日冕活动。本项目由美国国家科学基金会和日本财团全球伙伴关系中心科学奖学金计划资助。* * *

9722489 Kundu This award provides funds to support a three-month research visit by Dr. Mukul R. Kundu, Department of Astronomy, University of Maryland at College Park, for collaboration with Dr. Takashi Sakurai, Narikura Solar Observatory, National Astronomical Observatory, Mitaka, Japan. Their research is concerned with studies of the sun's corona and solar flares using simultaneously obtained X-ray and radio data from the Japanese Space mission Yohkoh and ground based radio telescopes, especially, the Nobeyama Radioheliograph in Japan. Three specific projects included in this research, covering a broad range of coronal phenomena are (1) a study of radio emission associated with coronal X-ray jets discovered by SXT (soft-X-ray brightenings which originate in the low corona and then propagate through the corona along magnetic loops), using both low-frequency and highfrequency radio data; and (2) a study of the evolution of active regions in terms of flare productivity; and (3) a survey of the Xray emission above sunspot umbrae, in order to determine the nature of the corona directly above sunspots; this will be combined with radio data on the magnetic fields above the same spots. Dr. Kundu has made pioneering contributions to the knowledge of the sun's corona using combined radio and X-ray imaging data. Dr.Sakurai will bring his theoretical expertise to the problem of studying solar active regions and flares from the point of view of magnetic energy storage and trigger mechanisms. Their complementary expertise is expected be an asset to their collaborative studies. The project will provide to the U.S. scientist access to unique resources, not available elsewhere in the world, for study of the sun's coronal activities. This project is supported under the Science Fellowship Program between the National Science Foundation and the Japan Foundation Center for Global Partnership. ***