We present new observations of the reconnection outflow jet obtained from the crossing of a solar wind reconnection exhaust by the Wind spacecraft on 5 March 2001. The outflow jet is characterized by a bifurcated configuration, which is different from typical reconnection exhausts. The two outflow jets are mainly distributed in the region close to the exhaust boundaries. Between the two jets, the bulging of the magnetic field and the slight depression of the plasma density are observed. The possible mechanism for the bifurcation of the outflow jet has also been investigated by using a magnetohydrodynamics (MHD) simulation of Petschek-type reconnection. The dynamic patterns of the reconnection exhaust are analyzed in detail. We find that the bifurcated jet is one of the transient configurations produced in the magnetic reconnection. Other observed features of the exhaust show similar agreement with the predictions from the simulation. The study of the reconnection exhaust, over multiple spatial scales, provides an insight into the dynamic evolution of solar wind reconnection exhausts.

中文翻译：

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太阳风重连排气中的分叉流出射流

我们展示了从 2001 年 3 月 5 日风号航天器穿越太阳风重联排气口获得的重联外流射流的新观测结果。外流射流的特点是分叉配置，这与典型的重联排气口不同。两股流出射流主要分布在靠近排气边界的区域。在两个射流之间，观察到磁场的膨胀和等离子体密度的轻微下降。还通过使用 Petschek 型重联的磁流体动力学 (MHD) 模拟研究了流出射流分叉的可能机制。详细分析了重连排气的动态模式。我们发现分叉射流是磁重联中产生的瞬态配置之一。排气的其他观察特征显示与模拟的预测相似。在多个空间尺度上对重联排气的研究提供了对太阳风重联排气动态演变的深入了解。