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恒星のメインシーケンス末尾に磁気圏で誘導される光学および無線オーロラ
G Hallinan1, S P Littlefair2, G Cotter3
1California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA.
Nature
|July 31, 2015
まとめ
星の磁気圏から発する 放射能と光学的なオーロラ放射を 観測しました この発見は オーロラが一般的であり 木星よりも強力で 茶色矮星の天候に影響を与える可能性があることを示唆しています
科学分野:
- * 惑星科学
- * 天体物理学
- * 宇宙物理学
背景:
- * 磁気流と電子の落下によって 磁気化された惑星で オーロラが観測される.
- * ガス巨人は,大気の相互作用により,ラジオ,赤外線,光学,紫外線,X線のオーロラ放射を放出します.
- * 星の磁気活動は通常,惑星のオーロラとは異なり,低い大気圏から発生します.
研究 の 目的:
- * 星と茶色矮星の境界付近にある物体から同時に発する 放射能と光学的なオーロラ放射を報告する
- * 惑星のオーロラと比較して,これらの放射のエネルギー源と特徴を調査する.
- * これらの発見が磁気圏と恒星/亜恒星現象の理解に及ぼす影響を探求する.
主な方法:
- *同時にラジオと光学スペクトル観測.
- * 恒星のメインシーケンス端にある恒星からのオーロラ放射の分析.
- * 磁気圏の電流システムとエネルギー結合の特徴
主要な成果:
- * 観測対象から発する無線と光学的オーロラ放射の検出
- * これらのオーロラは,外側の磁気圏から発生する磁気流によって動いていることを確認します.
- * 散らばったエネルギーは木星の磁気圏より少なくとも4倍の大きさです.
- * オーロラは,大規模な磁気圏の潜在的に至る所に存在するシグネチャーとして特定されました.
結論:
- * オーロラは惑星に限定されず,恒星のメインシーケンス端にある物体でも発生します.
- * これらの天体における磁気圏のプロセスは,太陽系で観測されるよりも著しく高い輝度を持つオーロラを動かすことができます.
- * これらの磁気流は,ブラウン・ダワーンの気象現象に影響を与える可能性があります.
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