sec after launching at an altitude of about 220 km. The experimental period was divided into three categories. The first period (I) was mainly devoted to the study of the Ohmic heating. As the Ohmic heating requires a reasonable amount of electronneutral collisions, a long duration (10 sec) transmission of the microwave was made during the period (I) when the rocket passes through the lower ionosphere where the collision frequency is high. In the second (II) and third (III) period, main focus is laid on the study of the nonlinear plasma wave excitation. The microwave was transmitted intermittently with a 5 sec transmission followed by a 5 sec pause. In the second phase, the dependence is studied of the nonlinear process on the ionospheric plasma parameters such as the electron density and the geomagnetic field which change with altitude. In the third phase after the daughter rocket separation, main interest was laid on the dependence of the nonlinear process of the plasma wave excitation on the distance between the mother-and-daughter rocket, i.e., the local intensity of the microwave field. MAIN RESULTS The magnetron transmitter system which is reinforced against the rocket vibration and shocks worked perfectly during the flight. All the other diagnostic instruments were also perfect in their operation. A videotape was resumed by the resuming team. The tape contained the video information of the separation of the daughter rocket. It was taken by the monitor TV camera installed on the top of the mother rocket. Some of the video frame will be shown at the oral presentation. The measurement of the electron temperature showed no temperature increase was detected both in the phase (I) and at the timing when an artificial neutral nitrogen gas was injected to increase the electron-neutral collisions. It turned out that the estimated temperature increase is of the order of 100 degrees which is not measurable by the temperature or Langmuir probes used in the MINIX. However, it should be noted that this result does not mean at all that the SPS microwave energy beam does not cause the Ohmic heating in the ionosphere. Even though the power density
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