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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Bulk flows of hot plasma in the Jovian magnetosphere: A model of anisotropic fluxes of energetic ions
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Bulk flows of hot plasma in the Jovian magnetosphere: A model of anisotropic fluxes of energetic ions

机译：木星磁层中热等离子体的大量流动：高能离子各向异性通量的模型

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Since the Ulysses flyby of Jupiter in February 1992, a consistent picture of the bulk flows of hot plasma has yet to be formed. The present study reports a comprehensive analysis of energetic particle anisotropies from the Ulysses mission. We present an empirical model which separates flow from gradient anisotropies. The model employs a multidimensional minimization routine to fit simultaneously 13 free parameters using 98 measurements. The large number of independent measurements is possible because the Ulysses Heliosphere Instrument for Spectra, Composition, and Anisotropy at Low Energy (HI-SCALE) has nearly full angular coverage at high time resolution and moderately high angular resolution. The model uses the full energy range (similar to 50-3000 keV) of the low-energy magnetic spectrometers and also the pure proton channels of the composition aperture on the instrument. We present flow results during the inbound pass of Ulysses in which the radial velocity component shows a persistent radial outflow. The azimuthal component is in the sense of planetary rotation but generally below rigid corotation, and the azimuthal velocity is greater near the plasma current sheet than at higher magnetic latitudes. Outbound, the flows in the high-latitude duskside magnetosphere inferred from the particle anisotropies indicate, surprisingly, sunward flows opposite to planetary rotation. We find evidence of gradient anisotropies especially near the magnetospheric current sheet on the dayside. We present a picture of the global magnetic field configuration and flows of hot plasma, consistent with our model results, dominated by subcorotation at low latitudes but by sunward flow at high latitudes. [References: 48]
机译：自从1992年2月尤利西斯（Elysses）飞越木星以来，尚未形成热等离子体总体流动的一致图景。本研究报告了从尤利西斯任务的高能粒子各向异性的综合分析。我们提出了一种将流量与梯度各向异性分开的经验模型。该模型采用多维最小化例程，使用98个测量值同时拟合13个自由参数。大量的独立测量是可能的，因为用于低能谱，组成和各向异性的尤利西斯日光层仪器（HI-SCALE）在高时间分辨率和适度的高角分辨率下具有几乎完整的角度覆盖范围。该模型使用低能电磁光谱仪的全部能量范围（类似于50-3000 keV）以及仪器上成分孔径的纯质子通道。我们在尤利西斯（Ulysses）的入场通行期间呈现流动结果，其中径向速度分量显示持续的径向流出。方位角分量在行星旋转的意义上，但通常低于刚性同转，并且等离子电流片附近的方位角速度大于较高纬度的方位角速度。从粒子各向异性推断出的高纬度黄昏磁层中的出流表明，出乎意料的是，与行星旋转相反的向阳流。我们发现梯度各向异性的证据，尤其是在白天磁层电流表附近。我们呈现了与我们的模型结果一致的全局磁场配置和热等离子体流动的图片，其中低纬度的亚同向旋转，高纬度的向阳流动主导。 [参考：48]

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