关于环行星轨道中磁旋转不稳定性的存在性
On the Viability of the Magnetorotational Instability in Circumplanetary Disks
摘要：
我们研究磁旋转不稳定性（MRI）是否可以作为一种机制的角动量输运在环行星盘。为了使MRI工作，电离度必须足够高，并且磁压力必须充分低于气体压力。我们计算的电离度的空间分布和搜索的MRI活动区域，其中两个标准都得到满足。我们发现，可以有薄的活动层在磁盘表面取决于模型参数，但是，我们几乎没有找到任何区域，可以维持发达的MRI湍流;当磁场增强MRI湍流在磁盘表面层，磁主导的大气侵入较低的高度和发达的MRI湍流的区域变得更小。我们的结论是，如果有没有角动量转移机制以外的磁共振成像引力稳定的行星盘，气体很可能会堆积，直到磁盘变得引力不稳定，大规模的磁盘可能会生存很长一段时间。
英文摘要：
We examine whether the magnetorotational instability (MRI) can serve as a mechanism of angular momentum transport in circumplanetary disks. For the MRI to operate the ionization degree must be sufficiently high and the magnetic pressure must be sufficiently lower than the gas pressure. We calculate the spatial distribution of the ionization degree and search for the MRI-active region where the two criteria are met. We find that there can be thin active layers at the disk surface depending on the model parameters, however, we find hardly any region which can sustain well-developed MRI turbulence; when the magnetic field is enhanced by MRI turbulence at the disk surface layer, a magnetically dominated atmosphere encroaches on a lower altitude and a region of well-developed MRI turbulence becomes smaller. We conclude that if there are no angular momentum transfer mechanisms other than MRI in gravitationally stable circumplanetary disks, gas is likely to pile up until disks become gravitationally unstable, and massive disks may survive for a long time.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
