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Updated: Mar 30, 2026

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Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
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火星周辺の軌道高度での塵観測
L Andersson1, T D Weber2, D Malaspina2
1Laboratory for Atmospheric and Space Physics, University of Colorado-Boulder, Boulder, CO 80303, USA. laila.andersson@lasp.colorado.edu.
まとめ
惑星間塵の粒子は高空で火星の大気圏に 侵入していることが観測されています この発見は 塵の運搬に関する以前の仮定に 異議を唱え 太陽系内部の理解に影響を与えます
科学分野:
- 惑星科学
- 大気科学
- 天文地質学
背景:
- 塵は火星の表面近くで多く見られるが,高海拔 (>150 km) でその存在は既知の大気過程によって説明できなかった.
- 過去のモデルでは,火星の高度150km以上で 重要な塵の濃度が考慮されなかった.
研究 の 目的:
- 火星の大気圏の高地にある 塵の存在と起源を調査する
- 観測された塵粒子の特性を分析し,惑星間塵の動力学への影響を分析する.
主な方法:
- 火星大気と揮発性進化 (MAVEN) 宇宙船に搭載されたラングミュア探査機と波器を使用した.
- 高度150kmから1000km以上までの塵の分布データを分析した.
- 観測データと塵の性質の実験室測定を比較した.
主要な成果:
- 以前考えられていたよりかなり高い高さで,150キロメートルから1000キロメートル以上の高さで検出されました.
- 観測された塵の分布は 惑星間起源を示すと解釈した
- 推定塵粒の大きさは1〜12ミクロメートルで,速度18km/sを想定しています.
結論:
- 火星の大気圏に 惑星間塵が 入り込んでいることが確認されました
- 太陽系内部の惑星間塵源,シンク,輸送の理解を向上させる直接的な証拠を提供した.
- 火星の大気プロセスに 塵が与える影響を強調しました
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