主讲人：David T. Blewett 研究员

JohnsHopkins University Applied Physics Lab, USA

时  间：2017年8月31日，上午10:00 – 11:30

地  点：遥感楼517会议室

摘要：Strange and beautiful brightmarkings known as lunar swirls are found in many locations on the lunarsurface. The most famous of these is the Reiner Gamma swirl in OceanusProcellarum, on the western nearside. It has been known since the late 1970'sthat lunar swirls are correlated with areas of magnetized crustal rocks,although the relationship between the swirls and the magnetic anomalies is notclear. There are several hypotheses for the formation of the swirls. One ideais modification of the surface by a comet impact. Other concepts involveinteraction of the solar wind with the crustal magnetic fields. The presence ofthe magnetic anomaly may shield the surface from sputtering and implantation bysolar wind ions, causing abnormal conditions of space weathering. Thus, theswirls are a natural laboratory for the study of space weathering and planetarymagnetism. I will review the characteristics of lunar swirls, examine theirrelationship with magnetic anomalies, and discuss recent evidence from spacecraftthat sheds light on the formation of these enigmatic features.

报告人简介：DavidT. Blewett is a member of the Principal Professional Staff in the PlanetaryExploration Group at the Johns Hopkins University Applied Physics Laboratory inMaryland, USA. He was a member of the science team for the NASA MESSENGER Mercury orbiter mission. Hewas also a member of the Dawn scienceteam for the Vesta phase of the mission. His research interests are planetarysurface processes, space weathering, remote sensing, and reflectancespectroscopy. He received a bachelor's degree in astronomy and astrophysicsfrom the University of Pennsylvania, and master's and Ph.D. degrees (geologyand geophysics) from the University of Hawaii.