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精密な太陽の形とその変動性
1Institute for Astronomy, University of Hawaii, Pukalani, Maui, HI 96790, USA. kuhn@ifa.hawaii.edu
Science (New York, N.Y.)
|August 21, 2012
まとめ
太陽の正確な形状は未だに捉え難いままです. この研究は,表面活動に影響を受けない恒常的な太陽の平らさを明らかにし,太陽の外層の自転が遅くなることを示唆しています.
科学分野:
- ソーラー物理学 ソーラー物理学
- 星の天体物理学 星の天体物理学
- ヘリオフィジックス ヘリオフィジックス
背景:
- 太陽の正確な形状を決定することは,広範な光電気観測にもかかわらず,挑戦的でした.
- 完璧な球体 (非球体性) から太陽の偏差は,太陽の内部状態と太陽大気の敏感な指標です.
研究 の 目的:
- 長期にわたる宇宙実験による高解像度データを使用して,太陽の形状を正確に決定する.
- 太陽周期の変動が太陽の形状に及ぼす影響を調査し,理論的な予測と結果を比較する.
主な方法:
- 長年にわたる宇宙での実験から得られたデータの分析.
- 高空間解像度技術の適用により,太陽四肢の形状を測定する.
- 観測された太陽のぼろぼろさと理論モデルを比較する.
主要な成果:
- 太陽の平らな形状は,はっきりと恒定であり,太陽周期の表面の変動によって著しく影響を受けないことがわかりました.
- 測定された太陽のぼろぼろさは,現在の理論モデルによって予測されるよりも著しく低い.
- この不一致は,太陽の大気圏の外層の微分回転が遅いことを示唆している.
結論:
- 太陽の形状は安定しており,表面活動から大きく独立しています.
- 現在のモデルでは,太陽の外部地域における微分回転速度に関する精細化が必要になる可能性があります.
- この発見は,太陽の内部ダイナミクスと大気の振る舞いを理解するための新しい制約を提供します.
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