Photoionization as a loss process of the Sodium Exosphere at Mercury: A Seasonal dependence observed by MESSENGER

Jamie Matthew Jasinski, NASA Jet Propulsion Laboratory, Pasadena, CA, United States, Tim Cassidy, University of Colorado Boulder, Boulder, CO, United States, Jim M Raines, University of Michigan Ann Arbor, Ann Arbor, MI, United States, Neil Murphy, JPL, Pasadena, CA, United States and James A Slavin, University of Michigan Ann Arbor, Department of Climate and Space Sciences and Engineering, Ann Arbor, MI, United States