ガリレオ・フォトポリメーター・ラジオメーターからのヨーロッパでの気温: 夜間の熱異常

Spencer¹, Tamppari, Martin

¹Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA. Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109, USA. Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025, USA.

Science (New York, N.Y.)

|May 29, 1999

まとめ

ガリレオガリレオはガリレオです.

科学分野:

惑星科学は惑星科学である.
天文学 (astronomy) 天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは,天文学 (astronomy) とは
地質物理学地質物理学とは地質物理学です.

背景:

木星の衛星であるヨーロッパは,潜在的な地表下海洋の関心の対象である.
ユーロパの表面温度変動を理解することは,その居住可能性と地質学的活動を評価するために不可欠です.

研究の目的:

ヨーロッパのガリレオ観測から得られた熱放出データを分析する.
予期せぬ夜間気温パターンとその潜在的な原因を調査する.

主な方法:

ガリレオの近赤外線マッピングスペクトロメーター (NIMS) のデータを活用した.
ヨーロッパの低緯度地域における昼間の明るさの温度を分析した.
表面アルベドと地質学的特徴と相関する気温データ.

主要な成果:

観測された低緯度の昼間の明るさの温度は86〜132ケルビンであった.
異常な夜間気温が特定され,特にPwyllクレーター噴出毛布の近くに高かった.
表面アルベドや地質学とは無関係に,日没後の温度で赤道最低値を発見した.

結論:

夜間の気温の異常は,熱慣性または局所的な内生熱流の地域的な変動を示唆しています.
これらの発見は,ヨーロッパにおける内源的な熱流の理論的期待に異議を唱える.
これらの熱異常の起源を特定するために,さらなる調査が必要である.

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