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彗星シューメイカー-リーヴィー9号の衝突時の木星のEUVE観測
まとめ
彗星シューメイカー・レヴィ9号が木星に衝突し,中性ヘリウム (He I) 58.4 nm線の明るさが一時的に10倍に増加した. この明るくなるのは,太陽光が高空での衝撃の残骸から散らばるためだと考えられている.
科学分野:
- 惑星科学 惑星科学
- 天文学 天文学
- 宇宙物理学 宇宙物理学
背景:
- 1994年7月,シューメイカー・レヴィ9彗星が破片化し,木星に衝突した.
- このようなエネルギー的な出来事に対する木星系の反応は,科学的に非常に興味深いものです.
研究 の 目的:
- シュメイカー・レヴィ9彗星が木星の大気に衝突した影響を分析するために.
- 木星の放射の変化,特に中性ヘリウム (He I) の共鳴線を調査する.
主な方法:
- Extreme Ultraviolet Explorer (EUVE) 衛星からのデータを活用した.
- 彗星の断片が衝突する前,その間,そしてその後の観測を行った.
- 58.4 nm He I 共振線の強度を分析しました.
主要な成果:
- 58.4 nmのHe I線の明るさの一時的な十倍増加が観測されました. 衝突後約2〜4時間,より大きな断片については.
- 暫定的な明るさは,大気の大幅な乱れを示唆しています.
結論:
- ヘリウム線が明るくなる主な説明は,太陽光が高空で衝突した羽根の残骸によって反響的に散乱していることです.
- 電子の衝撃刺激とHe (((+) の放射性再結合は,観測された信号に潜在的に寄与する要因と考えられています.
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