Michael Stock, graduate student in the Physics Department, will present the department seminar. His talk is titled, "Interferometric Observations of Intra-cloud Lightning." A state of the art lightning interferometer system at Langmuir Laboratory uses very wide bandwidth measurements to provide exceptional resolution and sensitivity to processes that comprise each flash. The added sensitivity allows the detailed study of features of lightning flashes which were difficult or impossible to study before. 4 p.m. in Workman 101.