This is by far one of my favorite papers in the field! In this paper Dr. Motoba showed the simultaneous development of a substorm auroral onset in the northern (Iceland) and southern (Syowa station in Antarctica) hemisphere. This observation demonstrate the magnetospheric origin of auroral substorm.
Read the full article: http://onlinelibrary.wiley.com/doi/10.1029/2012GL051599/abstract
(Tip: Go to "Supporting Information" and download the movie of the event)
The video below is an example of a very dynamic substorm