MIST (Magnetosphere – Ionosphere – Solar Terrestrial Physics) meeting: L. J. Baddeley, D. A. Lorentzen, N. Partamies, V. A. Pilipenko, K. Oksavik, W. Denig, and X. Chen, Co-ordinated EISCAT and optical measurements of multiple equatorward propagating auroral arcs, Lancaster University, UK , April 2016