Global hybrid code simulations predict enhanced densities and magnetic field strengths not only in foreshock compressional boundaries on the flanks of the steady‐state dayside foreshock under near‐radial IMF conditions but also on the edges of the traveling foreshock cavities formed when slabs of interplanetary magnetic field (IMF) lines connect to the bow shock. The simulations predict only modest velocity or temperature perturbations attending the foreshock compressional/cavity boundaries. However, they predict pronounced flow enhancements and depressed temperatures accompanying the enhanced densities and magnetic field strengths on foreshock compressional/cavity boundaries transmitted into the magnetosheath. Many of these properties are similar to those of magnetosheath jets, previously attributed to processes occurring at locations where the solar wind flow makes a grazing encounter with a locally oblique bow shock. Simultaneous THEMIS observations upstream and downstream from the Earth’s bow shock from 1430 to 1630 UT on June 14, 2007 confirm simulation predictions for the direct transmission of foreshock cavities into the magnetosheath. Foreshock cavity density and magnetic field strength perturbations diminish very rapidly with distance upstream from the bow shock.

中文翻译：

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前震腔：通过弓冲击直接传递

全局混合代码模拟预测不仅在稳态IMF近径向IMF条件下稳态日间前兆侧面的前兆压缩边界中的密度和磁场强度都会增强，而且还会预测在行星际磁场平板形成的行进前兆腔的边缘上的密度和磁场强度的增强（IMF）线连接到弓弦电击。这些模拟仅预测出现在前震压缩/空穴边界的适度速度或温度扰动。然而，他们预测到显着的流动增强和温度下降，伴随着密度和磁场强度的增加，而前体的压缩/空穴边界则被传输到磁层。这些特性中的许多与磁希瑟射流的特性相似，以前归因于发生在太阳风流与局部倾斜的弓形冲击波相遇的地点的过程。在2007年6月14日UT在1430至1630 UT地球弓激波上游和下游同时进行的THEMIS观测，证实了将前震腔直接传输到磁石场的模拟预测。前弓腔的密度和磁场强度的扰动会随着弓首冲击上游的距离而迅速减小。