Recent observations of magnetospheric dynamics driven by interaction with both interplanetary coronal mass ejections (ICMEs) and high-speed solar wind streams (HSS) have shown periodic substorms to be common under strong driving. However there is still some debate as to whether these magnetospheric modes reflect a single underlying mechanism. It has also been shown that during these HSS driven intervals, geomagnetic indices show strong and extended driving. During these High-Intensity Long Duration Continuous AE Activity (HILDCAA) events the ground-based magnetic signatures often used to identify substorms do not necessarily correspond to substorm activity. However, the literature has, thus far, concentrated on the HSS intervals. We present an interval of periodic AE enhancements during the passage of a CIR that occurred over the 28th and 29th of January 2005 and show that these are most probably associated with recurrent substorm activity. An explanation for the recurrence of these substorms is presented.
7th Australian Space Science Conference. Proceedings of the 7th Australian Space Science Conference (Sydney 24-27 September, 2007) p. 118-129