Alexis LE Pichon¹, Marine De Carlo¹, Peter Näsholm Sr², Johan Kero³, Lars Ceranna⁴, Patrick Hupe⁵ and Fabrice Ardhuin⁶, (1)CEA/DAM- ILE DE FRANCE, Arpajon, France, (2)NORSAR, Kjeller, Norway, (3)Swedish Institute of Space Physics, Kiruna, Sweden, (4)BGR - Federal Institute for Geosciences and Natural Resources, Hannover, Germany, (5)BGR Federal Institute for Geosciences and Natural Resources, Hannover, Germany, (6)University of Bretagne Occidentale, CNRS, IFREMER, IRD, Plouzané, France