[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

[PEM12-P10] Characteristics of the magnetometer (MAG) for sounding rocket experiment (S-310-46) to observe sporadic E layer

*Ayako Matsuoka¹, Naofumi Murata², Hirotsugu Kojima³, Satoshi Kurita³, Kan Higashimura⁴, Ryuichi Okuda⁵, Akinori Saito⁵ (1.Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, 2.Environmental Test Technology Unit, Japan Aerospace Exploration Agency, 3.Research Institute for Sustainable Humanosphere, Kyoto University, 4.Graduate School of Engineering, Kyoto University, 5.Division of Earth and Planetary Science, Graduate School of Science, Kyoto University)

Keywords:magnetometer, sporadic E layer, ionosphere

The sporadic E layer has been studied for long time but many things about the physical processes of its formation and extinction remain unclear. We are planning to launch the S-310-46 sounding rocket to make in-situ and comprehensive observation of the sporadic E layer, and advance our understanding of its electromagnetic signature. Precise measurement of the magnetic field and its variation is necessary to derive the electric currents flowing inside and in the vicinity of the sporadic E layer, and study the relationship with the electric fields, charged particles, and neutral particles. We developed a precision vector magnetometer (MAG) for the S-310-46 experiment. MAG is a fundamental-mode orthogonal fluxgate magnetometer (FM-OFG), in which ultra-fine amorphous wire is used as the sensor core. It has the advantage of being small, lightweight and power-saving, compared with the conventional parallel fluxgate magnetometer. The first FM-OFG for space use was developed for Martian Moons eXploration (MMX), the project to explore Martian satellites, and succeeded by that for Comet Interceptor, the project to encounter a primordial comet. Although S-310-46 started later than these two projects, it is planned to be launched in 2024 owing to the short-term development, and will be the first opportunity to demonstrate FM-OFG in space. In addition, for the S-310-46 experiment, we applied Application Specific Integrated Circuit (ASIC) technology to reduce the electrical circuit size and power consumption. We finished the manufacturing of the flight model in 2023 and conducted the performance test, environment test and calibration. We will report the performance and characteristics of the MAG flight model.