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木星の大気流は数千キロの深さまで広がる
Y Kaspi1, E Galanti1, W B Hubbard2
1Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel.
Nature
|March 9, 2018
まとめ
木星の強力なジェットストリームは 数千キロの深さに達し 惑星の磁気分散領域に広がります ジュノ宇宙船の重力データから ダイナミックな大気が明らかになった
科学分野:
- 惑星科学
- 流体力学
- 地理学
背景:
- 木星の東西のジェットストリームは顕著な特徴ですが,その垂直の範囲は不明です.
- 木星の構造と進化を理解するには 大気の深部と内部の流れを理解することが重要です
研究 の 目的:
- 木星のジェットストリームの 観測の深さを決定する
- 木星の重力場と大気/内部ダイナミクスの関係を調査する.
主な方法:
- ジュノ宇宙船からの重力測定の分析
- 重力データを逆転して,風場と大気流のプロフィールを導き出す.
- 内部構造が重力ハーモニックに与える影響をモデル化する.
主要な成果:
- 奇数重力ハーモニック (J3,J5,J7,J9) は,ジェットストリームが数千キロの深さまで広がっていることを示しています.
- ジェットストリームの深さは 磁気分散領域に約3,000kmに達します
- 重力ハーモニック (J8,J10) も,導出された流れプロファイルと内部構造と一致しています.
- 木星の動的大気は,惑星の総質量の約1%を占めています.
結論:
- 木星の強力なジェットストリームは 以前考えられていたよりもはるかに深く浸透します
- ジュノの重力データは 木星の深部と大気の動態について 前例のない洞察力を提供します
- この発見により ガス巨大惑星の組成と循環のモデルが改良されました
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