2. Magnetospheric modification by plasma beam injection is a topic of current scientific interest; consequently, the results of these current researches can be applied to SPS magnetospheric effects (the present effort being one of such). However, the scale of SPS magnetospheric modifications is so many orders of magnitude larger than present modification experiments that theoretical efforts must be applied to determine the probable effects. In this initial assessment the emphasis is on examination of the physical basis of magnetospheric effects and selection of principal areas of concern. We have adopted the view of most experts on the subject of beam-magnetosphere interactions and have constructed a model of beam-magnetosphere interactions which yields results in agreement with this prevailing view. However, such theoretical views need to be tested against observations. For this reason, we have been pursuing the possibility of a beam-magnetosphere interaction experiment with a space shuttle facility. We recommend that DOE interest in the area of active experiments be maintained. 3. As is demonstrated in the BUARO and other barium releases, plasma instabilities play a major role in the interaction between the injected plasma and the ambient plasma. In the case of a very high speed plasma beam, the role of plasma instabilities may be even more significant than the interaction through Alfven shocks. Studies of ion beam-plasma instabilities in a plasma mixture of several species is difficult and is presently at the forefront of theoretical space plasma physics. We recommend that DOE maintains its interest in this area of basic research. We also emphasize that in areas such as this, it is not sufficient to rely on present knowledge, because there is little such knowledge. 4. Data on physical processes relevant to SPS assessment, such as argon ion charge-exchange and photo-excitation cross-sections, are generally consi80
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