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)