Emiliya Yordanova¹, Elisabeth Werner², Manuela Temmer³, Andrew P Dimmock¹ and Lisa Rosenqvist⁴, (1)IRF Swedish Institute of Space Physics Uppsala, Uppsala, Sweden, (2)LATMOS, Paris, France, (3)University of Graz, Institute of Physics, Graz, Austria, (4)FOI Swedish Defence Research Agency, Stockholm, Sweden