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太陽のコンベクションゾーンの南流は,各半球に1つの細胞があります
Laurent Gizon1,2,3, Robert H Cameron4, Majid Pourabdian4,2
1Max-Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany. gizon@mps.mpg.de.
Science (New York, N.Y.)
|June 27, 2020
まとめ
科学者は太陽の地表の流れをヘリオシズモロジーを用いてマッピングし,赤道に向かって単細胞のメリディアン流れを明らかにした. この発見は,太陽斑の漂移を説明する 流動輸送ダイナモモデルを支持する.
科学分野:
- 太陽物理学
- ヘリオ地震学
- プラズマダイナミクス
背景:
- 太陽の磁場は,地表のプラズマコンベクションから発生します.
- 太陽の周期で赤道に向かって移動する.
- 太陽ダイナモモデルの鍵となるのは メリディアンフローの理解です
研究 の 目的:
- 太陽の2つの太陽周期 (1996年−2019年) にわたる南極流 (緯度および放射) を推論する.
- 太陽磁場発生と太陽光斑の移動におけるメリディアンフローの役割を調査する.
主な方法:
- 地下プラズマの動きを分析した
- 2つの独立したデータソースを用いて,2001年から2011年にかけてのクロス検証を行いました.
主要な成果:
- 太陽の各半球で 単細胞の流動パターンを確認した
- コンベクションゾーンの底 (45°緯度で~4 m/s) で測定された赤道へのプラズマ輸送.
- 2つのデータソースの重複期間の一貫性が実証された.
結論:
- 観測されたメリディアン流は,流量輸送ダイナモモデルを支持する.
- 南流は,太陽斑の出現緯度の赤道方向の漂移を説明する重要な要素です.
- 太陽光ダイナモ内の重要なプロセスに関する観測的証拠を提供します.
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