Japan Geoscience Union Meeting 2022

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[J] Oral

M (Multidisciplinary and Interdisciplinary) » M-TT Technology & Techniques

[M-TT45] Brand-new scope of coupling geophysics being established by infrasound and associated waves

Sun. May 22, 2022 3:30 PM - 5:00 PM 202 (International Conference Hall, Makuhari Messe)

convener:Masa-yuki Yamamoto(Department of systems engineering, Kochi University of Technology), convener:Mie Ichihara(Earthquake Research Institute, University of Tokyo), convener:Takayuki Otsu(Japan Weather Association), Chairperson:Takayuki Otsu(Japan Weather Association), Yasuhiro Nishikawa(Kochi University of technology. School of System Engoneering.)

3:30 PM - 3:45 PM

[MTT45-01] Trajectory determination of Hayabusa2 re-entry capsule based on infrasound observations.

*Yasuhiro Nishikawa1, Masa-yuki Yamamoto1, Islam HAMAMA1 (1.Kochi University of technology. School of System Engoneering.)

Keywords:microbarometer, Hayabusa2, Re-entry

On 2020 December 5 at 17:28 UTC, Japan Aerospace Exploration Agency’s Hayabusa2 sample return capsule (SRC) re-entered Earth’s atmosphere. The capsule passed through the atmosphere at supersonic speeds, emitting sound, and light. The inaudible sound was recorded by infrasound sensors installed by Kochi University of Technology and Curtin University. Based on analysis of the recorded infrasound, the trajectory of the SRC in two cases, one with constant-velocity linear motion and the other with silent flight, could be estimated with an accuracy of 0.5 in elevation and 1 degree in direction. A comparison with optical observations suggests a state of flight in which no light is emitted but the sound is emitted. In this presentation, we describe the method and results of the trajectory estimation.