磁気ケージ と ロープ が 太陽 噴火 の 鍵 と なっ て いる
Tahar Amari1, Aurélien Canou2, Jean-Jacques Aly3
1CPHT, Ecole Polytechnique, CNRS, Université Paris-Saclay, Route de Saclay, 91128 Palaiseau, France.
Nature
|February 9, 2018
まとめ
閉じ込められた太陽フレアは 複雑な磁気トポロジーではなく 歪んだ磁気流のロープの 不安定によって引き起こされます このフルスロープは
科学分野:
- 太陽物理学
- プラズマ天体物理学
- マグネトヒドロダイナミック
背景:
- 太陽フレアは,噴火または閉じ込められたとして分類されたエネルギー的な冠状イベントです.
- 閉じ込められたフレアには冠状質量放出がなく,その誘発メカニズムは議論の余地があります.
- 以前のモデルは磁気トポロジーや流動ロープの不安定性に焦点を当てており,決定的な観測証拠が欠けていました.
研究 の 目的:
- 詳細な磁場モデリングを使用して,閉じ込められた太陽フレアのトリガーメカニズムを調査します.
- トポロジカルな複雑さとフルスロープの不安定さを主な原因として区別する.
- 静的および動的モデルのための入力として測定された光球磁場を使用します.
主な方法:
- 噴火前の冠状磁気状態を 静的なモデルでシミュレートした
- ダイナミックモデルを使って フレアイベントの進化を記録した
- 計測された光球磁場データをモデルへの入力として統合した.
主要な成果:
- 観測データと一致するために 磁気流のロープが不可欠でした
- 流れのロープはゆっくりと進化し,飽和し,そしてキック不安定のために噴出しました.
- 閉じ込められた磁場は より大きな噴火を防ぎましたが その弱さは イベントのエネルギーに影響しました
結論:
- 閉じ込められたフレアは 主に歪んだ磁気流のロープの不安定によって駆動されます.
- 磁気トポロジーはX線放射の局所化に影響しますが,主なトリガーではありません.
- 閉じ込められた磁場の強さは,フレアが閉じ込められているか,または冠状質量放出による噴火イベントになるかを決定します.
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