Tianlin Wang, University of Michigan Ann Arbor, Ann Arbor, MI, United States, Christopher S Ruf, University of Michigan Ann Arbor, Climate and Space, Ann Arbor, MI, United States, Valery U Zavorotny, NOAA/OAR/ESRL (retired), Boulder, CO, United States, Joel Johnson, Ohio State University, Electroscience Lab, Columbus, OH, United States and Yuchan Yi, The Ohio State University, Division of Geodetic Science, School of Earth Sciences, Columbus, OH, United States