Magnetospheric Physics using Energetic Neutral Atom (ENA) Imaging: Anticipating IMAGE C. J. Pollock, J. L. Burch (Both at Southwest Research Institute, San Antonio, TX, 78238; (210) 522-3978; email: cpollock@swri.edu) H. Funsten, D. McComas, S. Ritzau, and R. Skoug (All at Los Alamos National Laboratory, Los Alamos, NM, 87545) M.C. Fok (NASA/GSFC, Greenbelt Maryland, 20771) M. Grande (Rutherford Appleton Laboratory, Oxfordshre OX11 0QX, England) M. Gruntman (University of Southern California, Los Angeles California, 90089) M. Lampton (University of California at Berkeley, Berkeley CA, 94720) T. Mukai (Institute for Space and Astronautical Sciences, Kanagawa 229 Japan) E. Scime (West Virginia University, Morgan town WV, 26506) M. Shattenburg (Massachusetts Institute of Technology, Cambridge MA) P. Valek (Auburn University, Auburn AL, 36849) The New Millennium Magnetosphere: Integrating Imaging, Discrete Observations, and Global Simulations, Sixth Huntsville Modeling Workshop, Guntersville, Alabama, 26-30 October 1998. Energetic Neutral Atom (ENA) imagers to be flown soon on NASA's IMAGE and TWINS missions have the potential to revolutionize our understanding and view of the Earth's magnetosphere. The proverbial hand on the elephant's hip will become something else. The prospect of global ENA images over the energy range spanned by LENA, MENA, and HENA imagers offers visualization of ring current injection and evolution, energetic near-earth plasma sheet structures, auroral ion beams, superthermal ionospheric plasma outflows, and possibly even boundary layer structures such as the magnetopause and others. Aside from visualization, quantitative global measures of physically significant magnetospheric parameters, such as total ring current energy will become available. Global imaging will allow event timing studies to be substantially enhanced by virtue of heretofore non-existent first detection capability. Clearly, the potential here is large. In this paper, we will elaborate on these prospects. We will provide a brief description of the Medium Energy Neutral Atom (MENA) imager, currently under preparation for flight on IMAGE. Finally, we will allude to the problem of interpreting MENA images in terms of remote ion distributions. This inversion problem, inextricably associated use of ENA techniques to study magnetized plasmas, has received careful attention recently. Such attention is warranted and is producing promising results.