Dmitri Vainchtein¹, Xiao-Jia Zhang², Anton Artemyev², Didier Mourenas³ and Vassilis Angelopoulos⁴, (1)Camden, New Jersey, United States, (2)University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (3)CEA/DAM- ILE DE FRANCE, Savigny-sur-orge, France, (4)University of California, Los Angeles, Department of Earth, Planetary, and Space Sciences and Institute of Geophysics and Planetary Physics, Los Angeles, CA, United States