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arXiv 2004.11755physics.plasm-ph
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由磁重联产生的模式转换阿尔文波增强北极光的能量来源

Mode Converting Alfvén Waves from Magnetic Reconnection Enhancing the Energy Source for the Aurora Borealis

Harsha Gurram, Jan Egedal, William Daughton

摘要:

以往的研究表明,在磁重联过程中产生的霍尔磁场结构被动力学阿尔文波(KAW)带走。在这里,我们应用一个动力学模拟与离子/电子质量比接近其自然值,并发现大大降低阻尼率允许KAW转换成剪切阿尔文波(SAW)。对于磁尾重联,这些SAW提供了波能的有效传输,增强了北极光的能量输入,其数量级高于先前的估计。

英文摘要:

Previous studies have concluded that the Hall magnetic field structures generated during magnetic reconnection are carried away by kinetic Alfvén waves (KAW). Here we apply a kinetic simulation with an ion/electron mass ratio closer to its natural value and find that much-reduced damping rates permit the KAW to convert into shear Alfvén waves (SAW). For magnetotail reconnection these SAW provides efficient transport of wave energy, enhancing the energy input for the Aurora Borealis by orders of magnitude above previous estimates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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