Guan Le¹, Peter J Chi², Robert J Strangeway³, Christopher T Russell², James A Slavin⁴, Ian J Cohen⁵ and Frederick D Wilder⁶, (1)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (2)University of California Los Angeles, Department of Earth Planetary and Space Sciences, Los Angeles, CA, United States, (3)Univ California, Los Angeles, CA, United States, (4)University of Michigan Ann Arbor, Department of Climate and Space Sciences and Engineering, Ann Arbor, MI, United States, (5)Applied Physics Laboratory Johns Hopkins, Laurel, MD, United States, (6)University of Colorado at Boulder, Boulder, CO, United States