Ann Bauer¹, Jesse Ray Reimink², Tom Chacko³, Bradford J Foley⁴, Steven B Shirey² and D. Graham Pearson⁵, (1)University of Wisconsin Madison, Madison, WI, United States, (2)Carnegie Institution for Science, Department of Terrestrial Magnetism, Washington, DC, United States, (3)University of Alberta, Earth and Atmospheric Sciences, Edmonton, AB, Canada, (4)Pennsylvania State University, State College, PA, United States, (5)University of Alberta, Earth & Atmospheric Sciences, Edmonton, AB, Canada