土星のプラズマディスクの内部の変数回転周期
D A Gurnett1, A M Persoon, W S Kurth
1Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242, USA.
まとめ
土星の内部プラズマディスクと磁場は,その放射放出調節と同期する. これは,電波が内部円盤のプラズマの不安定性から発生し,土星の回転とともに徐々に相を逸していることを示唆している.
科学分野:
- 惑星科学 惑星科学
- 宇宙物理学 宇宙物理学
- プラズマ物理学 プラズマ物理学
背景:
- 土星のキロメートルの無線放射 (SKR) は,複雑で時間変動の調節を示しています.
- 土星のプラズマ円盤の内部の領域は,惑星の自転と磁気圏の相互作用の影響を受けるダイナミックな環境です.
研究 の 目的:
- 土星の内部プラズマ円盤の回転と土星のキロメートルの無線放射 (SKR) の調節期間の関係を調査する.
- SKR調節の起源と,土星の磁気圏内のプラズマプロセスとの関連を決定する.
主な方法:
- 土星のプラズマディスクの内部の領域からのインシトゥプラズマと磁場データの分析.
- プラズマ回転周期とSKRの観測された変調期間の比較.
主要な成果:
- 土星の内部プラズマディスクのプラズマと磁場は,SKRの調節期と同期して回転する.
- この同期性は,SKR変調が内側プラズマディスクから発生することを示している.
結論:
- SKRの調節は,遠心駆動によるコンベクティブの不安定性と,内部のプラズマディスクのプラズマ流出によって引き起こされる可能性が高い.
- 土星の回転に相対する緩やかな相滑りには,エンケラドスの中性ガス・トーラスからの電動結合と牽引が左右されます.
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