Frey, H. U., Amm, O., Chaston, C. C., Fu, S., Haerendel, G., Juusola, L., Karlsson, T., Lanchester, B., Nakamura, R., Østgaard, N., Sakanoi, T., Séran, E., Whiter, D., Weygand, J., Asamura, K., & Hirahara, M. (2010). Small and meso‐scale properties of a substorm onset auroral arc. Journal of Geophysical Research A - Space Physics, 115:, pp. 1-20. doi:10.1029/2010JA015537.