Time Structure of the Average Rotation Measure for Accretion Disk in Shearing Box Approximation

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astronomy Reports Pub Date : 2024-08-29 DOI:10.1134/S1063772924700495
M. A. Buldakov, A. S. Andrianov
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Abstract

Temporal structure of the average rotation measure and the evolution of energetic characteristics of accretion disk in a shearing box approximation are considered. The temporal structure of rotation measure consists of both low- and high-frequency alternating sign oscillations. The mechanisms responsible for these oscillations and their connection with the disk dynamo are discussed. The 2D distributions and the vertical structure of rotation measure and magnetic energy are analysed for times corresponding to extrema and close to zero values of rotation measure. It is shown that the extrema of rotation measure are formed on account of several individual turbulent structures with large amplitudes that are related to magnetorotational and Parker instabilities. It is found that the spatial locations of these structures correspond to areas with high local magnetic energy. The possibility of estimating the period of disk dynamo using measurements of rotation measure is discussed. Cases of Sgr A* and M87* are considered.

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剪切盒近似法中吸积盘平均旋转测量值的时间结构
摘要 研究了剪切盒近似中平均自转量的时间结构和吸积盘能量特征的演变。自转量的时间结构包括低频和高频交替符号振荡。讨论了这些振荡的机制及其与磁盘动力的联系。分析了旋转量和磁能在极值和接近零值时的二维分布和垂直结构。结果表明,自转量极值是由几个具有大振幅的单独湍流结构形成的,这些结构与磁动和帕克不稳定性有关。研究发现,这些结构的空间位置与局部磁能较高的区域相对应。讨论了利用自转量的测量来估计磁盘发电机周期的可能性。考虑了 Sgr A* 和 M87* 的情况。
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来源期刊
Astronomy Reports
Astronomy Reports 地学天文-天文与天体物理
CiteScore
1.40
自引率
20.00%
发文量
57
审稿时长
6-12 weeks
期刊介绍: Astronomy Reports is an international peer reviewed journal that publishes original papers on astronomical topics, including theoretical and observational astrophysics, physics of the Sun, planetary astrophysics, radio astronomy, stellar astronomy, celestial mechanics, and astronomy methods and instrumentation.
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