Interactions between energetic electrons and realistic whistler mode waves in the Jovian magnetosphere
Interactions between energetic electrons and realistic whistler mode waves in the Jovian magnetosphere
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DOI：
10.1002/2017ja023975
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
M. Soria-Santacruz;Y. Shprits;A. Drozdov;J. Menietti;H. Garrett;H. Zhu;A. Kellerman;R. Horne
中科院分区：
文献类型：
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作者：
M. Soria-Santacruz;Y. Shprits;A. Drozdov;J. Menietti;H. Garrett;H. Zhu;A. Kellerman;R. Horne
等离子波在形成强烈的木星辐射带中的作用尚不清楚。在这项研究中，我们使用基于伽利略航天器等离子波研究的广泛调查的现实波模型来计算由于上带和下带合唱而导致的俯仰角和能量扩散对木星高能电子的影响。两个基于地球的模型，全扩散代码和多功能电子辐射带代码，适用于木星磁层的情况，并用于解决 L = 10 时合唱团和电子之间的相互作用。我们还提出了对纬度波覆盖和初始电子分布的敏感性的研究。我们的分析表明，与下频带合唱相比，上频带合唱对电子动力学的贡献几乎可以忽略不计。对于 100 keV 电子，我们观察到扩散导致粒子向较低螺距角重新分布，并伴有一些粒子损失，这可能表明径向扩散或交换不稳定性很重要。对于高于 >500 keV 的能量，基于观测的初始电子分布仅受合唱波的微弱影响。理想情况下，我们需要传输发生之前的初始电子相空间密度来评估波加速的重要性，但这是不可用的。从这项研究中可以清楚地看出，电子相空间密度的形状和波的纬度范围对于电子加速和损失都很重要。
The role of plasma waves in shaping the intense Jovian radiation belts is not well understood. In this study we use a realistic wave model based on an extensive survey from the Plasma Wave Investigation on the Galileo spacecraft to calculate the effect of pitch angle and energy diffusion on Jovian energetic electrons due to upper and lower band chorus. Two Earth‐based models, the Full Diffusion Code and the Versatile Electron Radiation Belt code, are adapted to the case of the Jovian magnetosphere and used to resolve the interaction between chorus and electrons at L = 10. We also present a study of the sensitivity to the latitudinal wave coverage and initial electron distribution. Our analysis shows that the contribution to the electron dynamics from upper band chorus is almost negligible compared to that from lower band chorus. For 100 keV electrons, we observe that diffusion leads to redistribution of particles toward lower pitch angles with some particle loss, which could indicate that radial diffusion or interchange instabilities are important. For energies above >500 keV, an initial electron distribution based on observations is only weakly affected by chorus waves. Ideally, we would require the initial electron phase space density before transport takes place to assess the importance of wave acceleration, but this is not available. It is clear from this study that the shape of the electron phase space density and the latitudinal extent of the waves are important for both electron acceleration and loss.