Abstract With 32 ​Hz magnetic field data of Venus Express from May 2006 to August 2012, the global spatial distributions of 1-Hz waves in the near-Venusian space are presented in this paper. The occurrence rate of 1-Hz waves is maximized near the Venusian bow shock and decreases in the upstream with the distance away from the shock. Downstream of Venusian bow shock, some 1-Hz waves are swept in the magnetosheath. However, these waves cannot enter the induced magnetosphere. The distribution of 1-Hz waves shows a solar cycle variation which could be the influence of the newborn pickup ions. The wave occurrence rate is higher near the bow shock in the -E hemisphere, and the waves can propagate upstream farther in the +E hemisphere, while the occurrence rate of the downstream 1-Hz waves shows no clear hemispheric asymmetry. In addition, the 1-Hz waves in the near-Venusian space have a higher occurrence rate and a more widespread distribution in the quasi-parallel foreshock region than in the quasi-perpendicular region. It can be inferred that the 1-Hz waves in the quasi-parallel region are less affected by Landau damping and they can propagate farther in the foreshock.

中文翻译：

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近金星空间中一赫兹波的调查：金星快车观测

摘要 本文利用金星快车2006年5月至2012年8月的32Hz磁场数据，给出了近金星空间1Hz波的全球空间分布。1Hz 波的发生率在金星弓形激波附近最大，在上游随着远离激波而减小。在金星弓形激波的下游，一些 1Hz 的波在磁鞘中被扫过。然而，这些波不能进入感应磁层。1-Hz 波的分布显示了太阳周期变化，这可能是新生儿拾取离子的影响。-E半球靠近弓激波的波出现率较高，在+E半球波可以向上游传播更远，而下游1Hz波的出现率没有明显的半球不对称性。此外，近金星空间的1Hz波在准平行前震区比准垂直区具有更高的发生率和更广泛的分布。可以推断，准平行区的 1Hz 波受朗道阻尼的影响较小，可以在前震中传播得更远。