ガリレオ探査機の質量スペクトロメーター:木星の大気の構成
H B Niemann1, S K Atreya, G R Carignan
1Goddard Space Flight Center, Greenbelt, MD 20771, USA.
まとめ
ガリレオ探査機のデータが木星を明らかにした.
科学分野:
- 惑星科学は惑星科学である.
- 大気化学 大気化学
- イソトープ地球化学 イソトープ地球化学
背景:
- 木星の大気組成は,初期の太陽系についての洞察を提供します.
- これまでの木星の貴気体と同位体の測定は限られていた.
研究 の 目的:
- 木星の大気の詳細な組成を決定するために.
- 木星の元素と同位体の豊富さを太陽と恒星間の値と比較するために.
- 木星の大気成分の起源を調査する.
主な方法:
- ガリレオ探査機の四極質量スペクトロメーターを使用して木星の大気のインシット分析.
- ガス混合比と同位体比を0.5から21barまで測定する.
主要な成果:
- ヘリウムと水素の比率は太陽に近い.
- 炭素,硫黄,酸素の豊富さは太陽光値から大きく異なる.
- ネオンの豊富さは太陽光よりも数桁低い.
- 炭素と高貴ガスの同位体比は太陽のようなものです.
- デウテリウムと水素,ヘリウム3とヘリウム4の比率は,原太陽の組成と太陽の進化に新たな制約を与える.
結論:
- 木星の大気は,異なる元素の濃縮で複雑な形成の歴史を反映しています.
- 同位体測定は,デウテリウムからヘリウム-3への変換を含む,太陽系進化のモデルをサポートしています.
- ガリレオ探査機のデータは,木星の大気の研究の基準となる.
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