私たちの太陽系を通る恒星間風の数十年にわたる変化

P C Frisch¹, M Bzowski, G Livadiotis

¹Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA. frisch@oddjob.uchicago.edu

Science (New York, N.Y.)

|September 7, 2013

まとめ

太陽は太陽である.

科学分野:

*ヘリオフィジックスと宇宙物理学.
* 星間媒介と太陽系との相互作用.

背景:

*ヘリオスフィアは,太陽が局所的な恒星間介質を通過する動きによって形成されます.
* 恒星間風は40年間,宇宙船によって測定されてきた.
* 過去の測定では,星間原子の特定の流れ方向を示していた.

研究の目的:

* 恒星間流動方向の長期的な傾向を分析する.
*新しいデータと過去の観測を調和させるため.
* 観測された恒星間流動の変化の統計的有意性を決定する.

主な方法:

*複数の宇宙船のミッション (星間境界探査機,ユリセスなど) のデータの分析 ) を実施する.
*3つの異なる観測時代 (1972年−1978年,1992年−2002年,2009年−2010年) にわたる測定値の比較
* 恒星間流れの傾向の統計的評価エクリプティック経度.

主要な成果:

* 最近のデータは,中性星間原子の異なる流入方向を示唆しています.
* 恒星間流れの日食経緯の統計的に有意な線形増加が時間とともに検出されました.
*不確実性を含むすべてのデータを考慮すると,この観測された傾向が裏付けられます.

結論:

* 恒星間物質がヘリオスフィアに流れる方向は,時間とともに明らかに変化しています.
* この発見は,太陽系と局所的な恒星間介質の間のダイナミックな相互作用を理解するための意味を持つ.
* 長期モニタリングは,進化するヘリオスフィアの条件を特徴づけるのに不可欠です.

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