A Test of Magnetospheric Radio Tomographic Imaging with IMAGE and WIND S. Cummer (1), M. Reiner (2), B. Reinisch (3), M. Kaiser (2), J. Green (2), R. Benson (2), B. Manning (4), K. Goetz (2) 1 - Duke University 2 - NASA Goddard Space Flight Center 3 - University of Massachusetts, Lowell 4 - Observatoire de Paris - Meudon Recent proposals for tomographic imaging of the magnetosphere with multistatic radio propagation measurements have shown the scientific value of such a mission. The <10 Re WIND perigee passes during August 2000 afforded a unique opportunity to test and bound the capabilities of the radio tomography technique by measuring interspacecraft electromagnetic wave propagation parameters using the Radio Plasma Imager (RPI) on IMAGE as the transmitter and the WAVES instrument on WIND as the receiver. The primary goal of these experiments was to test the concept of magnetic field and electron density radio remote sensing with line-of-sight Faraday rotation measurements. A special linearly-polarized RPI signal at 828 kHz was transmitted for 2 hours on August 3, 2000 and slightly more than 4 hours on August 15, 2000. On both days, these transmissions were detected by WAVES on dayside propagation paths from 6.2-8.5 Re in length, and the observed power was roughly the expected level based on r^(-2) energy spreading. On August 15, the WAVES receiver sampled the RPI signal every 358 milliseconds on the non-spinning Z antenna and therefore resolved the signal modulation due partially to the two minute spin period of IMAGE. This data is analyzed to extract the time-varying Faraday rotation of the linearly polarized probe wave. This Faraday rotation is proportional to the path-integrated product of electron density and magnetic field, and we show how these measurements can be used to remotely sense spatially distributed magnetospheric electron density and magnetic field. _______________ Presented at the Fall American Geophysical Union Meeting, San Francisco, CA., December 15-19, 2000