Yoshifumi Futaana, IRF Swedish Institute of Space Physics Kiruna, Kiruna, Sweden, Moa Persson, Swedish Institute of Space Physics, Kiruna, Sweden, Kei Masunaga, Laboratory for Atmospheric and Space Physics, Boulder, CO, United States, Peter Kollmann, The Applied Physics Laboratory, John Hopkins University, Laurel, MD, United States and Stanislav V Barabash, Swedish Inst Space Physics, Kiruna, Sweden