论文标题
观察火星磁石中的通电电子
Observations of Energized Electrons in the Martian Magnetosheath
论文作者
论文摘要
这项观察性研究表明，在火星磁石中电子的幅度和位置比以前的研究提出的要复杂。火星磁石中的电子源于太阳风，当它们越过弓箭冲击时被电场加速。假设这种加速度仅针对冲击而定位，则预计鞘中的场对准电子分布将是高度不对称的。但是，在这项研究中未观察到这种不对称性。基于这里的分析，建议在火星弓冲击的下游发生另外的平行加速度。这种额外的加速抑制了电子分布的预期不对称性。因此，沿着磁石中的磁管沿两端绑在弓形冲击的两端，并行和反平行电子之间的能量差异小于20 eV。如果预期这种能量差为最大，我们发现能量差最多是预测值的25％。
This observational study demonstrates that the magnitude and location of energization of electrons in the Martian magnetosheath is more complex than previous studies suggest. Electrons in Mars's magnetosheath originate in the solar wind and are accelerated by an electric field when they cross the bow shock. Assuming that this acceleration is localized solely to the shock, the field-aligned electron distributions in the sheath are expected to be highly asymmetric. However, such an asymmetry is not observed in this study. Based on the analysis here, it is suggested that an additional parallel acceleration takes place downstream of the Martian bow shock. This additional acceleration suppresses the expected asymmetry of the electron distribution. Consequently, along a flux tube in the magnetosheath that is tied on both ends to the bow shock the difference in energization between parallel and anti-parallel electrons is less than about 20 eV. Where this energization difference is expected to be maximal, we find the energization difference to be at most 25% of the predicted value.
