Long-lived plasmaspheric plumes: What is the source of the plasma?

Michael Denton1,2, Joseph Borovsky1,3, Michelle F Thomsen4 and Daniel T Welling5, (1)Space Science Institute, Boulder, CO, United States, (2)New Mexico Consortium, Los Alamos, NM, United States, (3)University of Michigan, Ann Arbor, MI, United States, (4)Planetary Science Institute Tucson, Tucson, AZ, United States, (5)University of Michigan Ann Arbor, Climate and Space Sciences and Engineering, Ann Arbor, United States