S. Zou, A. Ridley, M. Moldwin, M. Nicolls, A. Coster, and M. Ruohoniemi. Multi-instrument Observations of Storm Enhanced Density (SED) during Oct. 24-25 2011 Storm: Implications for SED Formation Processes. J. Geophys. Res., volume 118, pages 7798-7809, 2013 .