Cancelled
*Benoit Langlais1, Michael E. Purucker2, Erwan Thébault1, Catherine L. Johnson3,4, Anna Mittelholz3, Robert J. Lillis5 (1.CNRS, Univ. Nantes, Univ. Angers, Nantes, France, 2.NASA/GSFC, Greenbelt, MD, USA, 3.Univ. British Columbia, Vancouver, BC, Canada, 4.Planet. Sci. Inst., Tucson, AZ, USA, 5.Univ. Calif., Berkeley, CA, USA)