The MINIX was the first trial of transmission of high power microwave in situ the ionosphere. We carried out this experiment in a hope that a local effect of the high intensity microwave of the SPS microwave beam can well be simulated and examined by a rather small scale experiment such as the MINIX. The Ohmic heating and associated density depletion could not be measured showing that the heating effect is of large-scale and slow-time-scale phenomenon. However, it was demonstrated that various plasma waves are excited in the microwave beam column. This may not be important from a viewpoint of the energy loss because the loss of the energy transmission due to the excitation of the plasma waves is less than 1%. However, the effect is significant in a sense that strong electrostatic waves are produced in the ionosphere and magnetosphere which may affect the high energy particle population through Landau and cyclotron resonances and diffuse them in both energy and pitch angles. Such secondary effect should be investigated in detail in the future before the realization of the SPS. Support of the MINIX by the rocket and telemetry teams at ISAS and KSC is greatly acknowledged.
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