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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Structure and statistical properties of plasmoids in Jupiter’s magnetotail
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Structure and statistical properties of plasmoids in Jupiter’s magnetotail

机译：结构和统计特性的等离子粒团在木星的磁尾

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Plasmoids and other reconnection-related signatures have been observed in Jupiter’s magnetotail through analysis of magnetic field and energetic particle data. Previous studies have established the spatial distribution and recurrence period of tail reconnection events, and identified the location of a statistical X-line separating inward and outward flow. Here we present new analysis focusing specifically on 43 plasmoid signatures observed in magnetometer data in order to establish the average properties and internal structure of Jovian plasmoids. We present statistics on the observed plasmoid length scale, duration, radial position, and local time distribution. On average, the observed plasmoids have a ~3 RJ radial extent and ~7 min duration and result in the closure of ~4–8 GWb of open flux from reconnection of open field lines in the postplasmoid plasma sheet. We also determine the amount of mass released and the magnetic flux closed in order to understand the role of tail reconnection in the transport of mass and flux in Jupiter’s magnetosphere. The observed plasmoid properties are consistent with a mass loss rate of ~0.7–120 kg/s and a flux closure rate of ~7–70 GWb/d. We conclude that tail reconnection and plasmoid release is an important method of flux transport at Jupiter but likely cannot account for the mass input from Io, suggesting that additional mass loss mechanisms may be significant. Finally, we examine the plasmoid interior structure through minimum variance analysis and find that most plasmoids lack a core field and are better described by magnetic loops rather than flux ropes.
机译：等离子粒团和其他reconnection-related一直在观察木星的签名通过分析磁场磁尾和高能粒子数据。建立了空间分布和复发时间的尾巴重新连接事件,统计和确定的位置x轴出入口分离流动。我们提出新的分析特别关注观察到磁强计43等离子粒团签名为了建立数据的平均属性和木星等离子粒团的内部结构。现在统计观察等离子粒团长度范围、持续时间、径向位置,当地时间分布。等离子粒团有一个~ 3 RJ径向伸长和~ 7分钟持续时间和导致~ 4 - 8而关闭打开通量从开放磁力线的重新连接postplasmoid等离子板。确定发布的质量和数量为了了解磁通关闭运输的尾巴重新连接的作用在木星的磁气圈质量和通量。观察到等离子粒团属性是一致的质量损失率0.7 ~ -120公斤/ s和通量关闭~ 7 - 70而/ d。尾巴重新连接和等离子粒团是一种释放通量传输在木星的重要方法可能不能从Io占质量的输入,表明额外的质量损失机制可能是巨大的。通过最低等离子粒团内部结构方差分析,发现大多数等离子粒团缺少一个核心领域,更好的描述磁回路而不是通量绳。

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