these instruments is depicted in Fig. 2. The mother section is below the plane denoted by “separation.” The microwave transmission was made by one of the two truncated wave-guide antennas connected to magnetrons. The magnetrons used in the MINIX are those designed for a home-use microwave oven with a transmitting power of 830 W. Most of the diagnostic instruments such as a VLF wide band receiver, an HF sweep frequency receiver, geomagnetic aspect meter, electron density and temperature meter and microwave detector are installed on the daughter section as illustrated in Fig. 2. The receiving antennas of the VLF and HF plasma waves are extended radially from the top portion of the daughter rocket as seen in Figs. 1 and 2. Each antenna element is 2 m in length and is used as a monopole antenna or is combined to form a dipole antenna. The HF sweep frequency receiver covered a frequency range of 0.1 MHz to 18 MHz with a sweeping time of 250 msec. The VLF receiver covers a frequency range of 60 Hz to 25 kHz. Three rectenna type antennas are installed at the bottom of the daughter rocket and extended radially to form four paddles as seen in Fig. 1. One of the four paddles is used not as an antenna but as a mirror to view down the Earth by a TV monitor camera which is looking up to the daughter rocket from the mother rocket. EXPERIMENTAL TIME SEQUENCE Figure 3 shows the trajectory of the S-520-6 rocket and MINIX experimental schedule along the orbit. The separation of the daughter rocket was made at t = 209
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