電子ビームとイオン組成は,Io とそのトーラスで測定されます

D J Williams¹, B H Mauk, R E McEntire

¹Johns Hopkins Applied Physics Laboratory, Johns Hopkins Road, Laurel, MD 20723, USA.

Science (New York, N.Y.)

|October 18, 1996

まとめ

木星に衝突したエネルギッシュな電子ビームが発見された.

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
プラズマ物理学プラズマ物理学

背景:

木星の月イオは,激しい火山活動の源であり,ガスとプラズマを木星系に放出しています.
イオのプラズマ・トーラスと木星の磁気圏の相互作用は複雑で,北極のプロセスに影響を与えます.
惑星の磁気圏におけるエネルギー粒子集団は,エネルギー伝達と大気現象を理解するために重要である.

研究の目的:

イオのガリレオのフライトバイで観測されたエネルギー粒子ビームの特徴を調査する.
これらのビームが木星の大気圏で可視オーロラを生成する可能性を決定する.
木星のトラス内のエネルギーイオンの空間的分布と組成を分析する.

主な方法:

ガリレオエネルギー粒子探知器のデータを活用した.
分析された磁場に整合した,エネルギーが15 keVを超える双方向の電子ビーム.
原子炉内のエネルギーイオン (陽子,酸素,硫黄) の組成測定を行った.

主要な成果:

Ioの飛行中に,磁場に整合した,2方向のエネルギーのある電子ビーム (>15 keV) を発見した.
これらの電子ビームは,木星の足跡で目に見えるオーロラを作り出すのに十分なエネルギーフックスを有しています.
トラス内のエネルギー陽子,酸素,硫黄イオンの空間分布は,硫黄が優位 (> 10 keV / 核) で区別されていることが判明しました.

結論:

イオの周辺から発生するエネルギッシュな電子ビームは,木星のオーロラディスプレイに直接貢献することができます.
イオトーラス内のイオンの明確な空間分布は,複雑なプラズマプロセスを強調しています.
硫黄イオンは,木星の内部磁気圏のエネルギー粒子集団の重要な構成要素です.

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