Stefano A Livi¹, George C Ho², Frederic Allegrini³, Peter Wurz⁴, H. T. Smith² and Mihir Indrajit Desai¹, (1)Southwest Research Institute, San Antonio, TX, United States, (2)Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States, (3)Southwest Research Institute San Antonio, San Antonio, TX, United States, (4)University of Bern, Physics Institute, Space Research and Planetary Sciences, Bern, Switzerland