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金星の夜空の輝きの中で,原子酸素の緑色の線を発見した
T G Slanger1, P C Cosby, D L Huestis
1Aeronomy Group, Molecular Physics Laboratory, SRI International, Menlo Park, CA 94025, USA. tom.slanger@sri.com
Science (New York, N.Y.)
|February 13, 2001
まとめ
原子酸素からの高強度のグリーンライン放射は,金星の夜側で検出されました. この発見は,緑色の線が惑星の大気中の分子酸素の豊富さの信頼できる指標ではないことを示唆しています.
科学分野:
- 惑星科学は惑星科学である.
- 大気物理学 大気物理学
- スペクトロスコーピーは,スペクトロスコーピーを用います.
背景:
- 原子酸素の緑線放射 (557.7 nm) は,既知の大気現象である.
- ヴェネラ軌道探査機のデータを含む,金星に関する以前の観測は,このような強い緑色の線放射を強調しませんでした.
研究 の 目的:
- 金星の夜側にある原子酸素緑線放射の存在と強度を調査する.
- 観測されたグリーンラインの強度を,他の大気排出量および既知のスペクトルデータと比較する.
主な方法:
- W. M. Keck I望遠鏡のHigh-Resolution Echelle Spectrograph (HIRES) を利用してスペクトル観測を行った.
- 557.7 nmでO ((1S - 1D) 原子酸素の緑線の強さを測定しました.
- 630 nmのO ((1D - 3P) 酸素赤線の上限値を取得しました.
主要な成果:
- 金星のナイトサイドで原子酸素から有意な緑色の線放射が検出されました.
- 観測された分子酸素排出量は,以前のヴェネラ軌道探査機のデータと一致しています.
- 測定された緑色の線の強度は予想外にも高かったため,ヴェネラスペクトルとの差異が生じた.
- 高い緑色/赤色の線の強度比が決定されました.
結論:
- 高い緑色/赤色の線比は,排出源が金星のイオン圏と関連していないことを示唆しています.
- 強い緑色の線放射の存在は,必ずしも分子酸素が豊富な大気を意味するものではありません.
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