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Title: Detection of Acoustic/Infrasonic/Seismic Waves Generated by Hypersonic Re-Entry of the HAYABUSA Capsule and Fragmented Parts of the Spacecraft
Authors: YAMAMOTO, Masa-yuki
ISHIHARA, Yoshiaki
HIRAMATSU, Yoshihiro
UEDA, Masayoshi
SHIBA, Yasuo
FURUMOTO, Muneyoshi
FUJITA, Kazuhisa
Issue Date: 25-Oct-2011
Publisher: Astronomical Society of Japan
Journal Title: Publications of the Astronomical Society of Japan
Volume: 63
Issue: 5
Start Page: 971
End Page: 978
Abstract: Acoustic/infrasonic/seismic waves were observed during the re-entry of the Japanese asteroid explorer "HAYABUSA” at 6 ground sites in Woomera, Australia, on 2010 June 13. Overpressure values of infrasound waves were detected at 3 ground sites in a range from 1.3 Pa, 1.0 Pa, and 0.7 Pa with each distance of 36.9 km, 54.9 km, and 67.8 km, respectively, apart from the SRC trajectory. Seismic waveforms through air-to-ground coupling processes were also detected at 6 sites, showing a one-to-one correspondence to infrasound waves at all simultaneous observation sites. Audible sound up to 1 kHz was recorded at one site with a distance of 67.8 km. The mother spacecraft was fragmented from 75 km down to 38 km with a few explosive enhancements of emissions. A persistent train of HAYABUSA re-entry was confirmed at an altitude range of between 92 km down to 82 km for about 3 minutes. Light curves of 136 fragmented parts of the spacecraft were analyzed in detail based on video observations taken at multiple ground sites, being classified into three types of fragmentations, i.e., melting, explosive, and re-fragmented types. In a comparison between infrasonic waves and video-image analyses, regarding the generation of sonic-boom type shock waves by hypersonically moving artificial meteors, both the sample return capsule and fragmented parts of the mother spacecraft, at an altitude of 401 km were confirmed with a one-to-one correspondence with each other.
Rights: (c) 2011 Astronomical Society of Japan
Type: Journal Article
URI: http://hdl.handle.net/10173/769
Appears in Collections:山本, 真行 (YAMAMOTO, Masa-yuki)

Please use this identifier to cite or link to this item: http://hdl.handle.net/10173/769

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