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太陽風による木星の無線放射とオーロラの制御
D A Gurnett1, W S Kurth, G B Hospodarsky
1Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA. donald-gurnett@iowa.edu
Nature
|March 5, 2002
まとめ
太陽からの惑星間ショックが,木星の放射能とオーロラを誘発する. これらの太陽のイベントは,磁気圏の変化を引き起こし,地球の地磁気嵐に似た電子を加速させます.
科学分野:
- 惑星科学は惑星科学である.
- 宇宙物理学 宇宙物理学
- 磁気圏物理学 磁気圏物理学
背景:
- 木星には強力な磁場と磁気圏があり,その証拠はラジオ放射である.
- 木星の極光は,電子によって発生する無線放射に関連して,地球の極光に似ている.
- 木星の放射能とオーロラの変動は,未だに十分に理解されていない.
研究 の 目的:
- 木星のヘクトメトリック無線と極紫色オーロラ放射の変動の原因を調査する.
- これらの排出量を太陽風の条件と磁気圏の活動と相関させるため.
主な方法:
- カッシーニとガリレオの宇宙船を使って,木星のラジオとオーロラ放射を同時に観測する.
- 惑星間ショックイベントと関連したデータの分析.
主要な成果:
- 木星のヘクトメトリックの放射放射と,極紫のオーロラ放射は,惑星間の衝撃によって引き起こされます.
- 惑星間の衝撃は,磁気圏の圧縮と再構成を引き起こします.
- このプロセスは強い電場を生成し,オーロラのフィールドラインに沿って電子を加速させます.
結論:
- 惑星間衝撃は,木星のラジオとオーロラ放射の変動の主な要因である.
- 電子加速のメカニズムは,地球の地磁気嵐のときのメカニズムと類似しています.
- この発見は,巨大惑星の磁気圏の動力学についての理解を深める.
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