considered for the case of release inside the plasmasphere The electric field of the Alfven wave at the ionosphere Ey = vx B0/c could not be estimated from qualitative considerations, since it must be calculated for a wave passing through a realistic plasmasphere. Here, from Fig. 10, we obtain Ey [[spi:math]] 30 mV/m for L=4 and 80 mV/m for L=3. In the auroral region, the natural ionospheric auroral currents are typically driven by electric fields of such magnitude. Thus, the effects of the ion engine beam include production of artificial auroral currents in the ionosphere. Further ramifications of this issue will be discussed in Section IV. B. We emphasize that this simulation is restricted to consideration of the largest-scale effects of beam-magnetosphere interactions, as is evidenced by the use of magnetohydrodynamic equations. For smaller spatial scales, we do not expect the interaction processes to be smooth at all. Indeed, we expect many plasma instabilities to take place. Some of these plasma waves will pitch-angle scatter some energetic argon ions out of the beam before the Alfven wave momentum transfer process is completed. So, we expect not only cold argon plasma but also argon ring current plasma from beam-magnetosphere interactions. Finally, we emphasize again that the picture of beam-magnetosphere interaction is based on the consensus of what we regard to be expert opinion in the field. At the COSPAR Symposium on Active Experiments in Budapest 1980, it was learned -that almost exactly the same picture of beam-magnetosphere interaction (Chiu, 1980) was evolved by Academician Sagdeev (1980) of the Soviet Union, based on results of the Soviet PORCUPINE ion beam injection experiments. 30
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