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月壳磁异常:空间等离子体与地质学的交叉Lunar Crustal Magnetic Anomalies: The Intersection of Space Plasmas and Geology

  日期:2017-8-25 16:06:21    浏览次数:

Lunar Crustal Magnetic Anomalies:

The Intersection of Space Plasmas and Geology

                     月壳磁异常:空间等离子体与地质学的交叉

主讲人:David T. Blewett 研究员

               Johns Hopkins University Applied Physics Lab, USA

  间:2017831日,上午10:00 – 11:30

  点:遥感楼517会议室

摘要:Strange and beautiful bright markings known as lunar swirls are found in many locations on the lunar surface. The most famous of these is the Reiner Gamma swirl in Oceanus Procellarum, on the western nearside. It has been known since the late 1970's that lunar swirls are correlated with areas of magnetized crustal rocks, although the relationship between the swirls and the magnetic anomalies is not clear. There are several hypotheses for the formation of the swirls. One idea is modification of the surface by a comet impact. Other concepts involve interaction of the solar wind with the crustal magnetic fields. The presence of the magnetic anomaly may shield the surface from sputtering and implantation by solar wind ions, causing abnormal conditions of space weathering. Thus, the swirls are a natural laboratory for the study of space weathering and planetary magnetism. I will review the characteristics of lunar swirls, examine their relationship with magnetic anomalies, and discuss recent evidence from spacecraft that sheds light on the formation of these enigmatic features.

报告人简介:David T. Blewett is a member of the Principal Professional Staff in the Planetary Exploration Group at the Johns Hopkins University Applied Physics Laboratory in Maryland, USA. He was a member of the science team for the NASA MESSENGER Mercury orbiter mission. He was also a member of the Dawn science team for the Vesta phase of the mission. His research interests are planetary surface processes, space weathering, remote sensing, and reflectance spectroscopy. He received a bachelor's degree in astronomy and astrophysics from the University of Pennsylvania, and master's and Ph.D. degrees (geology and geophysics) from the University of Hawaii.