Credit: Tanaka, T., Nakamizo, A., Yoshikawa, A., Fujita, S., Shinagawa, H., Shimazu, H., et al. Substorm convection and current system deduced from the global simulation. Journal of Geophysical Research, 115(A5), A05220. https://www.doi.org/10.1029/2009JA014676 (2010).