火星のグセフクレーターでスピリットローバーによって検出された風に関連するプロセス
R Greeley1, S W Squyres, R E Arvidson
1Department of Geological Sciences, Arizona State University, Box 871404, Tempe, AZ 85287-1404, USA. Greeley@asu.edu
まとめ
スピリット・ローバーのデータは,コロンビア・メモリアル・ステーションの風で荒廃した岩石と堆積物を明らかにしています. これらの地質学的特徴は,一貫した北北西風を示し,グセフクレーターの火星風景を形作っています.
科学分野:
- 惑星科学 惑星科学
- 地質学 地質学 地質学
- 大気科学 大気科学
背景:
- スピリット・ローバーの着陸地であるコロンビア・メモリアル・ステーションは,地質学的な特徴がエオリアの過程を示すことを示している.
- 火星の風のパターンを理解することは,地表の地質学と潜在的な居住可能性の解釈に不可欠です.
研究 の 目的:
- スピリット・ローバーの着陸地にある風で荒廃した岩石と堆積物の分析のため.
- ローバーのミッション中にグセフクレーターにおける風の方向と活動を決定するために.
主な方法:
- 風で荒廃した岩石,波紋,沈殿物の漂流の観測と分析.
- ロック・アブラージョン・ツールから採取された岩石の断片の非対称分布の分析.
- 観測された地質学的特徴と大気モデル予測の比較.
主要な成果:
- 岩石や堆積物を含む地形学的証拠は,北北西からの形成風を示唆しています.
- ローバーのドリル切断の非対称な分布は,北北西からの真昼の活発な風を示しています.
- いくつかの岩は,2色の外観のような特徴を示し,風の膨張 (5-60cm) によって埋葬と発掘を示唆しています.
結論:
- スピリット・ローバーの観測は,グセフクレーターでの午後風を予測する大気モデルと一致しています.
- 活発な風による侵食と堆積は,着陸地点の火星表面を形作るプロセスであることが確認されています.
- 証拠は,時間とともに風の膨張による表面材料の重要な垂直の移転を示唆しています.
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