Workshop on Unsolved Problems in Magnetospheric Physics: Østgaard, N., J.P. Reistad, P. Tenfjord, K. M. Laundal, S. Haaland, K. Snekvik, S. Milan, Unanswered questions regarding solar wind – magnetosphere interaction, Workshop on Unsolved Problems in Magnetospheric Physics, 6-12th September, 2015 Crown Spa Hotel, Scarborough, UK (Invited talk)