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星間境界探査機の観測を3Dの世界的なヘリオスフィアのモデルと比較
N A Schwadron1, M Bzowski, G B Crew
1Department of Astronomy, Boston University, Boston, MA 02215, USA. nathanas@bu.edu
まとめ
エネルギー中性原子 (ENA) シミュレーションは,いくつかの観測と一致しますが,ヘリオスフィアのリボンを見逃します. リボンは,局所的な恒星間磁場を反映している可能性があるため,ヘリオスフィアのプロセスに関する新しいモデルが必要です.
科学分野:
- 宇宙物理学 宇宙物理学
- ヘリオフィジックス ヘリオフィジックス
- 天体物理学 天体物理学
背景:
- 星間境界探査機 (IBEX) のエネルギー中性原子 (ENA) の観測により,複雑な日球構造が明らかになった.
- 現在のシミュレーションモデルは,観測された ENA 流量の大きさを部分的に複製しますが,顕著なヘリオスフィアのリボン特性を捉えることはできません.
研究 の 目的:
- ENAマップで観測されたヘリオスフィアのリボン起源を調査する.
- 地元の恒星間介質 (LISM) の磁場がヘリオスフィアの構造に及ぼす影響を調査する.
主な方法:
- LISMの磁場特性を組み込むヘリオスフィアのモデルの開発.
- 開発されたヘリオスフィアのモデルに基づく ENA マップのシミュレーション.
- ヘリオパウズに作用する力の分析,フィールドラインのドラピングとLISMのラム圧力を含む.
主要な成果:
- このモデルは,局所恒星間媒体の磁場がリボンに沿った視線に横切っていることを示唆している.
- 計算されたリボン圧力は,特定の条件下 (LOS 30-60 AU, B ((LISM) ~2.5 マイクロガウス) のフィールドラインのドレーピングとLISMのラム圧力の力と比較できます.
- 現存するモデルでは,リボンを含む観測されたすべての支配的なヘリオスフィアの特徴を完全に説明することはできません.
結論:
- ヘリオスフィアのリボンは,局所的な恒星間磁場のインプリントかもしれません.
- ヘリオスフィアの形成とダイナミクスの現在の理解を大幅に見直す必要があるかもしれません.
- シミュレーションモデルと包括的な ENA 観測を調和させるため,さらなる研究が必要です.
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