<論文>Planet-Aによる惑星間空間磁場計測計画

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Research theme and technical program of a high-sensitive magnetic observation in the interplanetary space are described in relation to the Planet-A Project on the Halley-Venus mission. Our main research theme is to study macroscopic and microscopic structures of the interplanetary magnetic field with a stress on examinations of hypotheses derived from the two-hemisphere model on the three-dimensional structure of the IMF. As for the technical program, we have already executed successfully four programs to develop a high-sensitive magnetometer to be installed on the Planet-A, namely, (1) construction of a magnetometer with a two-core having the world-largest dimension ratio, (2) comparative test of the twelve kinds of ring cores and construction of a magnetometer using the best one, (3) construction of two sets of very high-sensitive (0.036 nT/mm) station magnetometers on the basis of the result (2), (4) construction of a compact ring-core magnetometer to be installed on a balloon that is expected to be launched in September, 1979. Example magnetograms obtained with specially designed vertical-writing and lateral-writing recorders are shown in which a Pc3 event was registered directly by the ring-core magnetometers of (3) with a maximum range of more than 170 mm at the Onagawa Magnetic Observatory.
宇宙航空研究開発機構の論文