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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Jupiter's Ion Radiation Belts Inward of Europa's Orbit
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Jupiter's Ion Radiation Belts Inward of Europa's Orbit

机译：木星的木卫二的离子辐射带内轨道

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摘要

Jupiter is surrounded by intense and energetic radiation belts, yet most of the available in-situ data, in volume and quality, were taken outward of Europa's orbit, where radiation conditions are not as extreme. Here, we study measurements of ions of tens of keV to tens of MeV at <10 Jupiter radii (RJ) distance to Jupiter, therefore inward of the orbit of Europa. Ion intensities drop around 6 R_J,near Io's orbit. Previous missions reported on radiation belts of tens and hundreds of MeV ions located between 2 and 4 RJ. Measurements of lower energies were not conclusive because high energy particles often contaminate the measurement of lower energy particles. Here, we show for the first time that ions in the hundreds of keV range are present and suggest that ions may extend even into the GeV range. The observation of charged particles yields information on the entire field line, not just the local field. We find that there is a region close to Jupiter where no magnetic trapping is possible. Jupiter's innermost radiation belt is located at <2 R_J, inward of the main ring. Previous work suggested that this belt is sourced by re-ionized energetic neutral atoms coming steadily inward from distant regions. Here, we perform a phase space density analysis that shows consistency with such a local source. However, an alternative explanation is that the radiation belt is populated by occasional strong radial transport and then decays on the timescale of years.
机译：木星周围是激烈和充满活力辐射带,然而大多数可用的现场数据,在数量和质量木卫二轨道外,辐射不那么极端的条件。测量离子的十数万的凯文兆电子伏在< 10木星半径(RJ)的距离木星,因此内轨道的欧罗巴。附近的离子强度下降6 R_J Io轨道。带几十上百兆电子伏的离子2和4 RJ之间。能量没有确凿因为高的能量通常颗粒污染的测量低能量粒子。第一次离子数百keV范围存在,甚至表明,离子可能延长GeV范围。粒子收益率信息对整个领域线,而不是当地的领域。有一个地区接近木星磁捕获是可能的。最深处的辐射带位于< 2 R_J,内主要的戒指。这个皮带是源自re-ionized精力充沛中性原子不断向内来自遥远地区。分析显示一致性与这样一个地方源。填充的辐射带偶尔强径向运输衰变的时间尺度。

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