Structured ionospheric outflow during the Cassini T55-T59 Titan flybys - Edberg, NJT; Agren, K; Wahlund, J-E; Morooka, MW; Andrews, DJ; Cowley, SWH; Wellbrock, A; Coates, AJ; Bertucci, C; Dougherty, MK (PLANETARY AND SPACE SCIENCE, 2011)