Paul R Mahaffy¹, Heather B. Franz¹, Christopher R Webster², Sushil K Atreya³, Mehdi Benna¹, Peter Martin⁴ and Michael H Wong⁵, (1)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (2)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (3)University of Michigan Ann Arbor, Ann Arbor, MI, United States, (4)California Institute of Technology, Pasadena, CA, United States, (5)University of Michigan, Ann Arbor, MI, United States