论文标题
观察Jovian Magnetosheath中湍流的磁流失动力级联
Observation of Turbulent Magnetohydrodynamic Cascade in the Jovian Magnetosheath
论文作者
论文摘要
我们介绍了木星磁石（MS）中能量级联速率的首次估计。我们使用Juno Spacecraft上的船上使用Jovian Auroral分布实验（JADE）和磁力仪研究（MAG）仪器的原位观察结果，并与两个最近可压缩的模型一起研究了磁氢化动力学（MHD）尺度的级联速率。虽然在Jovian MS中观察到高水平的可压缩密度波动，但MHD惯性范围内存在恒定的能量通量。当存在密度波动时，MHD范围内可压缩的等温能量级联速率会增加。我们发现，木星的磁石中的能量级联速率至少比地球磁石中相应的典型值小两个数量级（100倍）。
We present the first estimation of the energy cascade rate in Jupiter's magnetosheath (MS). We use in-situ observations from the Jovian Auroral Distributions Experiment (JADE) and the magnetometer investigation (MAG) instruments onboard the Juno spacecraft, in concert with two recent compressible models to investigate the cascade rate in the magnetohydrodynamic (MHD) scales. While a high level of compressible density fluctuations is observed in the Jovian MS, a constant energy flux exists in the MHD inertial range. The compressible isothermal and polytropic energy cascade rates increase in the MHD range when density fluctuations are present. We find that the energy cascade rate in Jupiter's magnetosheath is at least two orders of magnitude (100 times) smaller than the corresponding typical value in the Earth's magnetosheath.
