We present the average distribution of energetic electrons in Jupiter's plasma sheet and outer radiation belt near the magnetic equator during Juno's first 29 orbits. Juno observed a clear decrease of magnetic field amplitude and enhancement of energetic electron fluxes over 0.1–1,000 keV energies when traveling through the plasma sheet. In the radiation belts, Juno observed pancake-shaped electron distributions with high fluxes at ∼90° pitch angle and whistler-mode waves. Our survey indicates that the statistical electron flux at each energy tends to increase from to . The equatorial pitch angle distributions are isotropic or field-aligned in the plasma sheet and gradually become pancake-shaped at . The electron phase space density gradients at MeV/G are relatively small at and become positive over , suggesting the dominant role of adiabatic radial transport at higher shells, and the possible loss processes at lower shells.

中文翻译：

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使用朱诺观测的木星等离子体片和外辐射带中磁赤道附近的高能电子分布

我们展示了在朱诺号的前 29 轨道期间木星等离子体片和磁赤道附近外辐射带中高能电子的平均分布。当穿过等离子体片时，朱诺观察到磁场幅度明显减小，高能电子通量在 0.1-1,000 keV 能量范围内增强。在辐射带中，朱诺观察到了在大约 90° 俯仰角和吹哨模式波处具有高通量的煎饼状电子分布。我们的调查表明，每个能量的统计电子通量趋于从到增加。赤道俯仰角分布在等离子体片中是各向同性的或场对齐的，并在 处逐渐变成薄饼状。MeV/G处的电子相空间密度梯度相对较小并变得积极，表明绝热径向输运在较高壳层的主导作用，以及可能在较低壳层的损失过程。