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1998 Fiscal Year Final Research Report Summary

In-situ measurement of high velocoty impact fragments of icy planets

Research Project

Project/Area Number 08454134
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

ARAKAWA Masahiko  Institute of Low Temperature Science, Hokkaido University, Ins., 低温科学研究所, 助手 (10222738)

Co-Investigator(Kenkyū-buntansha) KOUCHI Akira  Institute of Low Temperature Science, Hokkaido University, Prof., 低温科学研究所, 教授 (60161866)
Project Period (FY) 1996 – 1998
KeywordsIcy satellite / Impact process / Shock-wave attenuation / Catastrophic disputation / Reaccumulation
Research Abstract

High velocity impact among icy planets is an important physical phenomenon related to the planetary accretion process in the outer solar system. Then, an impact experiment on water ice was made by using a micro two-stage light gas gun installed in a cold room (-10゚C) to clarify elementary processes of the collisional disruption and to study reaccumulation condition of the impact fragments. As a result, we clarified that the shock pressure attenuated in the ice target according to the relation of P = a (Lp/d)^2 irrespective of the mass ratio between 10^-3 to 10^-5, where Lp is a projectile size and d is a propagation distance. We also observed that the shock wave propagated with the velocity of 4.4 km/s at the shock pressure from 10 to 200 GPa ; 2.6 km/s at 200 MPa. Below 200 MPa, the shear fracture region expanded with the velocity of 1.7 km/s until the shock pressure decreased lower than 60 MPa. The reaccumulation condition of icy planets in the high velocity collisions was estimated to show that fragments disrupted from parent bodies with the radius larger than 500 km could reaccumulate at any conditions of the impact velocity from 500 m/s to 5 km/s and the mass ratio from 10^-2 to l0^-5.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Arakawa, M.: "Collisional disruption of ice by high velocity impact" Proc.31th ISAS Lunar and Planetary Symp.13-16 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Higa, M., M.Kato, T.Kiyono, K.Sirai, M.Arakawa, S.Nakazawa, and Y.Iijima: "Shock-wave attenuation below 1 GPa in ice at 255K" Proc.31th ISAS Lunar and Planetary Symp.9-12 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Onose,. Naomi, M.Higa, M.Arakawa, A.Nakamura, and A.Fujiwara: "Velocity Distribution of Fragments from Impact Cratering" Proc.31th ISAS Lunar and Planetary Symp.5-8 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sugi, N., M.Arakawa, A.Kouchi and N.Maeno: "In-situ mass spectrometric observation of impact vaporization of water-ice at low temperatures" Geophys.Res.Lett.25. 837-840 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Higa, M., M.Arakawa and N.Maeno: "Size dependence of restitution coefficients of ice in relation to collision strength" Icarus. 133. 310-320 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jeniskinns, P., D.F.Blake and A.Kouchi: "Amorphous water ice- A solar system material" in Solar System Ices(ed.Schmitt et al.). 139-155 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Arakawa, M.: "Collisional disruption of ice by high velocity impact" Proc.31th ISAS Lunar and Planetary Symp.13-16 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Higa, M., M.Kato, T.Kiyono, K.Shirai, M.Arakawa, S.Nakazawa, and Y.Iijima: "Shock-wave attenuation below 1 GPa in ice at 255K" Proc.31th ISAS Lunar and Planetary Symp.9-12 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Onose, Naomi, M.Higa, M.Arakawa, A.Nakamura, and A.Fujiwara: "Velocity Distribution of Fragments from Impact Cratering" Proc.31th ISAS Lunar and Planetary Symp.5-8 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Sugi, N., M.Arakawa, A.Kouchi and N.Maeno: "In-situ mass spectrometric observation of impact vaporization of water-ice at low temperatures" Geophys.Res.Lett.25. 837-840 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Higa, M., M.Arakawa and N.Maeno: "Size dependence of restitution coefficients of ice in relation to collision strength" Icarus. 133. 310-320 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jeniskinns, P., D.F.Blake and A.Kouchi: "Amorphous water ice- A solar system material" Solar System Ices (ed.Schmitt et al.). 139-155 (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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