Revet G, Khiar B, Filippov E, Argiroffi C, Béard J, Bonito R, Cerchez M, Chen S N, Gangolf T, Higginson D P, Mignone A, Olmi B, Ouillé M, Ryazantsev S N, Skobelev I Yu, Safronova M I, Starodubtsev M, Vinci T, Willi O, Pikuz S, Orlando S, Ciardi A, Fuchs J
Institute of Applied Physics RAS, Nizhny Novgorod, Russia.
LULI, CNRS, CEA, Sorbonne Université, École Polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
Nat Commun. 2021 Feb 3;12(1):762. doi: 10.1038/s41467-021-20917-x.
The shaping of astrophysical outflows into bright, dense, and collimated jets due to magnetic pressure is here investigated using laboratory experiments. Here we look at the impact on jet collimation of a misalignment between the outflow, as it stems from the source, and the magnetic field. For small misalignments, a magnetic nozzle forms and redirects the outflow in a collimated jet. For growing misalignments, this nozzle becomes increasingly asymmetric, disrupting jet formation. Our results thus suggest outflow/magnetic field misalignment to be a plausible key process regulating jet collimation in a variety of objects from our Sun's outflows to extragalatic jets. Furthermore, they provide a possible interpretation for the observed structuring of astrophysical jets. Jet modulation could be interpreted as the signature of changes over time in the outflow/ambient field angle, and the change in the direction of the jet could be the signature of changes in the direction of the ambient field.
本文通过实验室实验研究了由于磁压力导致天体物理外流形成明亮、致密且准直喷流的过程。在此，我们考察了源于源的外流与磁场之间的不对准对喷流准直的影响。对于小的不对准情况，会形成一个磁喷嘴并将外流重定向为准直喷流。随着不对准程度增加，这个喷嘴变得越来越不对称，从而破坏喷流的形成。因此，我们的结果表明外流/磁场不对准是调节从太阳外流到河外喷流等各种天体喷流准直的一个合理关键过程。此外，它们为观测到的天体物理喷流结构提供了一种可能的解释。喷流调制可解释为外流/环境场角度随时间变化的特征，而喷流方向的变化可能是环境场方向变化的特征。
