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衝突による水素化小惑星の爆発的な分散による惑星間塵
Kazushige Tomeoka1, Koji Kiriyama, Keiko Nakamura
1Department of Earth and Planetary Sciences, Faculty of Science, Kobe University, Nada, Kobe 657-8501, Japan. tomeoka@kobe-u.ac.jp
Nature
|May 2, 2003
まとめ
地球は毎年3万トンの塵を集めています. 衝撃実験では,水素化隕石は無水質よりも簡単に断片化することが明らかになり,塵の大きさの粒子 (微小隕石) がより大きな隕石よりも一般的であることを説明しています.
科学分野:
- 宇宙塵の研究 宇宙塵の研究
- 惑星科学は惑星科学である.
- 隕石学は,隕石についてです.
背景:
- 地球は毎年約3万トンの塵粒子を蓄積しています.
- 集まった塵粒 (微小隕石) は,水素化,多孔性の隕石と化学的,鉱物学的類似性を共有しています.
- 大気フィルタリングに起因する微小隕石と回収された多孔隕石の豊富さの間に大きな違いがあります.
研究 の 目的:
- 衝撃条件下にある多孔性隕石の断片化行動を調査する.
- 流星が大気圏に入るときに水分が流星の生存能力に与える影響を判断する.
- 微小隕石と隕石における水素物質の相対的豊富さの観察された差異を説明するために.
主な方法:
- 水素化および無水性多孔隕石の両方に衝撃回復実験を実施しました.
- 衝突条件をシミュレートするために,変化する圧力を適用します.
- 結果の粒子の大きさの分布と断片化パターンを分析した.
主要な成果:
- 水素化隕石への衝撃適用は,微小な粒子に広範な断片化を引き起こしました.
- 水性隕石は,無水性隕石と比較して,より広い圧力範囲で爆発的な膨張を示した.
- 水素体を含む小惑星の衝突は,無水体を含むものよりもはるかに高い割合で塵を生成します.
結論:
- 衝突時の水素化小惑星からのより高い塵の発生率は,微小隕石の水素化物質の豊富さを説明する.
- 微小隕石における水素物質の観察された豊富さは,大気圏への侵入前に確立されています.
- 大気フィルタリングは,回収された滝の間で多孔性隕石が少ない主な理由ではありません.
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