Transport and Loss of Thermal Plasma From the Plasmasphere Leonard N. Garcia, James L. Green, Robert Benson, Bill Sandel, Bodo Reinisch The IMAGE/Extreme Ultraviolet imager (EUV) has shown that plasmaspheric plumes are relatively common and are an important part of the plasmaspheric erosion process. Through these plumes dense thermal plasma is transported out of the inner magnetosphere towards the dayside magnetopause. The eventual fate of this thermal plasma is still a subject of debate. This material may be convected into the polar cusp, over the polar cap, the low latitude boundary layer or across the magnetopause and lost into the magnetosheath. When the IMAGE orbit apogee (~8 Re) was in the dayside magnetosphere, the Radio Plasma Imager (RPI) observations show evidence of density enhancements which we associate with EUV observations of plasmaspheric plumes. RPI resonance soundings have provided accurate estimates of the plasma densities in this region. These RPI observations extend the time history of the thermal plasma transport after a plasmaspheric erosion event by tracking this material beyond the field of view of the EUV instrument and to densities below its sensitivity threshold. _______________ Spring Joint Assembly, American Geophysical Union, Baltimore, Maryland, U.S.A., 23-26 May 2006