13:45 〜 14:00
[MTT43-01] HTV Infrasound Phase Identification in Near and Far Field Records
キーワード：HTV, Infrasound Propagation, Ray Tracing, KUT, Rocket Launch
Nowadays, infrasound technology is to be involved in many applications. As the generation of shockwave in different layers in the atmosphere is a key to detect and track movable objects. Rockets can be considered one of important infrasound sources which emit acoustic signals during the launch process and the re-entry in atmosphere.
H-II Transfer Vehicle KOUNOTORI (HTV) which delivers the supplying to International Space Station (ISS) started the first mission since 2009 and operated annually until 2020, Different infrasound phases were detected at Kochi University of Technology (KUT) Infrasound Sensor Network (KUT) from HTV-06 to HTV-09. At, I30-JP infrasound observatory of the international monitoring system (IMS) recorded some phases as well. Because of the complexity of the rocket source, the assumption of point source was carried out in this study to identify the approximate height of the source in different stages which are generated infrasonic waves. Infrasound propagation modeling was applied to identify the predicted infrasound phases which could reach to the stations. Ray tracing and normal mode numerical methods were also carried out to estimate the expected celerities and the transmission loss from the source to stations from different altitudes.
In conclusion, the near and far field recordings are important in rocket induced infrasound detection to identify the different infrasound phases. In addition, the propagation modeling is a key to understand the arrivals in the stations. However, as the rocket is non-point source, additional study is still indeed to enhance the results.
H-II Transfer Vehicle KOUNOTORI (HTV) which delivers the supplying to International Space Station (ISS) started the first mission since 2009 and operated annually until 2020, Different infrasound phases were detected at Kochi University of Technology (KUT) Infrasound Sensor Network (KUT) from HTV-06 to HTV-09. At, I30-JP infrasound observatory of the international monitoring system (IMS) recorded some phases as well. Because of the complexity of the rocket source, the assumption of point source was carried out in this study to identify the approximate height of the source in different stages which are generated infrasonic waves. Infrasound propagation modeling was applied to identify the predicted infrasound phases which could reach to the stations. Ray tracing and normal mode numerical methods were also carried out to estimate the expected celerities and the transmission loss from the source to stations from different altitudes.
In conclusion, the near and far field recordings are important in rocket induced infrasound detection to identify the different infrasound phases. In addition, the propagation modeling is a key to understand the arrivals in the stations. However, as the rocket is non-point source, additional study is still indeed to enhance the results.