2023年4月日冕物质抛射驱动的地球阿尔文翼
Earth's Alfvén wings driven by the April 2023 Coronal Mass Ejection
AI总结:
本文报道2023年4月CME磁云中亚阿尔文速太阳风使地球磁层形成阿尔文翼的罕见现象,基于MMS任务观测揭示了冷CME等离子体直接撞击、翼丝磁连接及重联捕获等离子体等特征,深化了对CME与行星磁层相互作用及亚阿尔文速流影响天体物理体的理解。
摘要:
我们报告了地球磁层与亚阿尔文速太阳风相互作用的一种罕见状态,在这种状态下,类似风向袋的磁层转变为具有阿尔文翼的磁层。在2023年4月24日一个日冕物质抛射(CME)的磁云中,NASA的磁层多尺度任务识别出以下特征:(1)未受激波加热且被加速的冷CME等离子体直接迎面撞击地球的昼侧磁层;(2)动态翼丝代表了磁层与太阳爆发磁通量绳足点之间新的磁连接通道;(3)观测到冷CME离子伴随被加速的对流电子,这是CME等离子体因磁云与阿尔文翼场线之间发生重联而被捕获的证据。所报告的测量结果推进了我们对CME与行星磁层相互作用的认识,并为理解亚阿尔文速等离子体流如何影响水星、木星的卫星以及靠近其宿主恒星的系外行星等天体物理体开辟了新机会。
英文摘要:
We report a rare regime of Earth's magnetosphere interaction with sub-Alfvénic solar wind in which the windsock-like magnetosphere transforms into one with Alfvén wings. In the magnetic cloud of a Coronal Mass Ejection (CME) on April 24, 2023, NASA's Magnetospheric Multiscale mission distinguishes the following features: (1) unshocked and accelerated cold CME plasma coming directly against Earth's dayside magnetosphere; (2) dynamical wing filaments representing new channels of magnetic connection between the magnetosphere and foot points of the Sun's erupted flux rope; (3) cold CME ions observed with energized counter-streaming electrons, evidence of CME plasma captured due to reconnection between magnetic-cloud and Alfvén-wing field lines. The reported measurements advance our knowledge of CME interaction with planetary magnetospheres, and open new opportunities to understand how sub-Alfvénic plasma flows impact astrophysical bodies such as Mercury, moons of Jupiter, and exoplanets close to their host stars.
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