Raymond J Walker¹, Giovanni Lapenta², Mostafa El-Alaoui³, James M Weygand⁴, Jean Berchem⁵, Robert L Richard⁵ and David Schriver⁵, (1)University of California Los Angeles, Department of Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (2)Katholieke Universiteit Leuven, Department of Mathematics, Leuven, Belgium, (3)UCLA, Physics and Astronomy, Los Angeles, CA, United States, (4)IGPP/UCLA---ESS, Los Angeles, CA, United States, (5)University of California Los Angeles, Department of Physics and Astronomy, Los Angeles, CA, United States