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火星の朝のターミネーターで見られた非常に高い高度の羽根です
A Sánchez-Lavega1, A García Muñoz2, E García-Melendo3
11] Departamento de Física Aplicada I, ETS Ingeniería, Universidad del País Vasco, Alameda Urquijo s/n, 48013 Bilbao, Spain [2] Unidad Asociada Grupo Ciencias Planetarias UPV/EHU-IAA (CSIC), Alameda Urquijo s/n, 48013 Bilbao, Spain.
Nature
|February 18, 2015
まとめ
火星では,非常に高い高さの羽根が観測され,イオノスフィアとエクソスフィアに広がっています. これらの現象は,おそらく氷の雲や強烈なオーロラであり,現在の大気モデルに挑戦しています.
科学分野:
- 惑星科学は惑星科学である.
- 大気科学 大気科学
- エアロノミーはエアロノミーです.
背景:
- 火星の端は,100km以下の層状の氷雲と60kmまでの塵を含む複雑な大気現象を明らかにしています.
- 地殻の磁気異常に関連したオーロラからの放射は,高度130kmで検出されています.
研究 の 目的:
- 火星のターミネーターで観測された前例のない高空の羽根の発生を報告し,分析する.
- フォトメトリックの測定を用いてこれらの羽根の性質を調査し,既存の大気モデルと比較する.
主な方法:
- フォトメトリック測定を用いて,火星のターミネーターで羽根の観測.
- 羽根の特徴の分析:高度,範囲,持続時間,変動性,位置.
- 光測定データ分析により,粒子反射 (氷/塵) とオーロラからの放射を区別する.
主要な成果:
- 2012年3月~4月に,午前終点で,非常に高い高度 (200-250km+) の2つの明るい羽根が観測されました.
- 梅は500〜1,000kmの範囲に広がり,約10日間続いたが,日々の変動が急激だった.
- フォトメトリックデータは,塵よりもCO2またはH2Oの氷雲 (0.1μm半径) を好み,または非常に強いオーロラ放射 (>1,000x地球の) を好みました.
結論:
- 観測された羽根は,火星のイオノスフィアとエクソスフィアの内部で,典型的な雲や塵の層をはるかに超える高さで発生しました.
- 両方の好意的な説明 (氷の雲や激しいオーロラ) は,現在の火星上層大気動態の理解に異議を唱える.
- 急速な進化と周期的な行動は,火星の極端な高度で発生するユニークな大気プロセスを示唆しています.
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