火星グローバルサーベヤー熱放出スペクトロメーターからの結果
P R Christensen1, D L Anderson, S C Chase
1Arizona State University, Tempe, AZ 85287, USA. phil.christensen@asu.edu
まとめ
この研究では,火星の表面の構成は主にピロキセン-プラジオクラゼの混合物であり,かなりの量の塵が含まれていることが明らかになりました. 大気観測では,塵の霧,水氷の雲,そして大きな塵の嵐が観測され,極地層の撤退は過去の観測を反映した.
科学分野:
- 惑星科学は惑星科学である.
- 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.
- 大気科学 大気科学
背景:
- 火星表面の構成と大気動態を理解することは,惑星探査にとって極めて重要です.
- 以前のミッションでは,低アルベド地域について,限られたスペクトルデータを提供した.
研究 の 目的:
- 火星の低アルベド表面材料の鉱物学的組成を決定するために.
- 塵の霧,雲,塵の嵐を含む大気現象を特徴づけるために.
- 火星の南極点の変化を監視するために.
主な方法:
- 火星からの熱放出スペクトロメーター (TES) データの分析.
- 表面鉱物の成分を特定するためのスペクトル分離.
- 大気条件を研究するために,四肢と表面の特徴の観察.
主要な成果:
- 低アルベドの表面に最適なスペクトルは,粉塵の35%とピロキセンの4:1対プラジオクラゼの混合物を示しています.
- 炭酸塩 (<10%),オリビン (<10%),粘土鉱物 (<20%),クォーツ (<5%) に上限値が設定されました.
- 観測により,北半球で最大55キロメートルの高さの塵と水氷の雲が明らかになった.
- ノアチス・テラ地域では,大規模な砂嵐が起こりました.
- 南極帽の撤退パターンは,バイキングのミッションデータと一致していた.
結論:
- 火星の低アルベド表面は,ピロキセンとプラジオクラスが支配しており,かなりの塵の成分があります.
- 火星の大気は,砂嵐や水氷雲など,ダイナミックな特徴を示しています.
- ポラーキャップのダイナミクスは,異なるミッション時代の類似性を示しています.
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