作为天体物理喷流稳定机制的剪切流
Sheared Flow As A Stabilizing Mechanism In Astrophysical Jets
摘要：
据推测，持续的狭窄性观察到的渐近圆柱形区域的双极流出年轻恒星天体（YSO）表明，这些喷流磁准直。在z箍缩等离子体中观察到的j交叉B力是这些观察结果的一个可能的解释。然而，z箍缩等离子体受到电流驱动的不稳定性（CDI）。利用z箍缩进行受控核聚变的兴趣导致了磁约束等离子体稳定性的广泛理论。从这个领域的分析，数值和实验证据表明，剪切流在磁化等离子体可以降低增长率的香肠和扭结不稳定性。在这里，我们提出的假设，剪切螺旋流可以发挥类似的稳定影响CDI在YSO射流。
英文摘要：
It has been hypothesized that the sustained narrowness observed in the asymptotic cylindrical region of bipolar outflows from Young Stellar Objects (YSO) indicates that these jets are magnetically collimated. The j cross B force observed in z-pinch plasmas is a possible explanation for these observations. However, z-pinch plasmas are subject to current driven instabilities (CDI). The interest in using z-pinches for controlled nuclear fusion has lead to an extensive theory of the stability of magnetically confined plasmas. Analytical, numerical, and experimental evidence from this field suggest that sheared flow in magnetized plasmas can reduce the growth rates of the sausage and kink instabilities. Here we propose the hypothesis that sheared helical flow can exert a similar stabilizing influence on CDI in YSO jets.
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