学术讲座公告---How would a 60-year-old mystery in space physics be resolved?

  • 发布时间:[2018-02-02] 来源:[学院] 点击量:[1586]

报告题目:
How would a 60-year-old mystery in space physics be resolved, based on a student CubeSat (CSSWE) measurement?
报告人:
李炘璘(美国科罗拉多大学University of Colorado Boulder,教授,博士生导师,美国”微型卫星计划CubeSat”项目主持人)
报告时间:
2018年2月5日下午3:30
报告地点
电子信息学院303会议室

报告主题简介:
      
Colorado Student Space Weather Experiment (CSSWE) CubeSat was launched on September 13th, 2012, operated more than two years and has been a tremendous success in Education, Engineering and Science. More than 65 students have involved with this project, working diligently with mentoring and supervision from experienced LASP engineers. Five Ph.D. dissertations are closely related to this mission, and there have been 21 peer-reviewed papers associated with CSSWE published, with about one-third of these engineering research papers and two-thirds science research papers. Most recently, we have resolved a 60-year-old mystery regarding the source population of inner radiation belt electrons solely based on the measurements of Relativistic Electron and Proton Telescope integrated little experiment (REPTile), the sole science payload onboard. The results were published in Nature in December 2017 [1], leading to a wealth of media, national and international, coverage.
       In this presentation, I will review the engineering endeavor leading to the completion of CubeSat systems and describe the data analysis effort leading to the most recent publication in Nature, in which we show direct measurements of relativistic electrons near the inner edge of the inner radiation belt and demonstrate, for the first time, that the main source of these electrons is cosmic-ray albedo neutron decay (CRAND), and that this CRAND process also contributes to electrons elsewhere in the inner magnetosphere.
[1] Li, Xinlin, Richard Selesnick, Quintin Schiller, Kun Zhang, Hong Zhao, Daniel Baker, and Michael Temerin (2017), Measurement of electrons from albedo neutron decay and neutron density in near-Earth space, Nature,552, 382-385, doi:10.1038/nature24642.

报告人简介:
李炘璘教授,1992年获美国达特茅斯大学(Dartmouth College)理学博士学位,现为美国科罗拉多大学(University of Colorado Boulder)的大气与空间物理实验室以及航天航空工程科学系教授,博士生导师,主要研究方向为:太阳风能量向地球磁层空间的耦合过程、地球磁层能量粒子动力学、空间微型科学卫星的研发。李炘璘教授是美国多个卫星计划(包括THEMIS, SAMPEX, IMEX, Van Allen Probes)的联合合作人,也是NASA MORE卫星计划的副主持人。近年来,李炘璘教授带领一个以科罗拉多大学的研究生为主要力量的科学团队,设计、开发了美国NSF资助的面向学生的CubeSat微型卫星,用于近地空间高能粒子辐射环境的观测,取得了远超预期的巨大成功,已发表17篇相关的高水平学术论文。他联合主持的第二个CubeSat微型卫星(MinXSS)已于2016年5月16日通过国际空间站发射入轨,主要研究太阳耀斑激发的X射线的能谱分布及其对地球电离层、热层、中间层的影响,也取得了圆满成功。李炘璘教授是美国NASA日球物理研究发展路线(Roadmap)委员会成员,在权威国际学术期刊发表SCI论文超过150篇,总引用率4000余次。李炘璘教授也具有丰富的教学经验,教授的课程包括航天航空环境、空间动力学、航天硬件设计、热力学。


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