Theoretical Study of Magnetohydrodynamic Phenomena in Active Celestial Objects

活动天体磁流体动力学现象的理论研究

• 批准号: 03302013
• 负责人: SHIBATA Kazunari
• 金额: $ 3.71万
• 依托单位: National Astronomical Observatory
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03302013/
• 关键词: active objects; magnetic field; hydrodynamics; magnetic reconnection; MHD shock; accretion; jet; dynamo; アクリ-ション

The purposes of this project are to organize cooperative research on various magnetohydrodynamic phenomena (reconnection, dynamo, MHD turbulence, MHD wave, jet, accretion, etc.) observed in many active celestial objects, and to encourage active communication between researchers, who are studying similar physical processes, in different fields (e.g., astronomy, nuclear fusion, plasma physics, geophysics, fluid mechanics).In order to accomplish these objectives, we held a symposium on cosmic MHD phenomena at Atami in September, 1992. More than 60 people attended. We discussed not only theoretical research results but also observational results in relation to various cosmical plasmas ranging from fusion plasmas to intergalactic plasmas. Specific items we discussed are; dynamo processes in fusion plasmas, convection and dynamo in terrestrial and planetary cores, vortex reconnection, magnetic reconnection and Kelvin-Helmholtz instability in terrestrial magnetosphere, acceleration and dynami … More cs of solar wind, magnetohydrodynamic phenomena in the Sun (especially on magnetic reconnection and dynamic phenomena in the solar corona observed by YOHKOH), jet formation in black hole magnetosphere, magnetic field in star forming regions, MHD phenomena in interstellar space, intergalactic magnetic fields, etc.Major results obtained by these researches are summarized in the following;(1) We compared magnetic reconnections occurring in the tail of terrestrial magnetosphere and in the solar corona, and found that the formation and acceleration of plasmaids play a key role in both cases. This has also been confirmed by 2D and 3D MHD numerical simulations of magnetic reconnection for both terrestrial and solar cases.(2) Various dynamic phenomena (loops, jets, spincules) similar to solar coronal dynamic phenomena have been discovered in disk galaxies from detailed comparison between solar coronal images taken by YOHKOH and high resolution optical images of disk galaxies. Numerical simulations have also been done for the Parker instability both in disk galaxies and in the Sun, which explains the formation of magnetic loops in disk galaxies and the Sun. Less

这是在许多活性天体中观察到的各种磁性水力学现象（Dynamo，MHD，MHD，MHD波，喷气，增生等）上合作的目的融合，血浆物理学，流体机制）。远程等离子等离子体的距离等离子体。在以下情况下形成区域，星际磁场等。 GES Takoh和高分辨率的磁盘星系和太阳的光学图像

项目成果

Hanawa,T.: "ParkerーJeans Instability of Magnetized Gaseous Disks," Publ.Astron.Soc.Japan. 43No.5. 685-702 (1991)

Hanawa, T.：“磁化气态盘的 Parker-Jeans 不稳定性”，Publ.Astron.Soc.Japan 43No.5 (1991)。

Hirotani,K.: "Time Variation of Magnetohydrodynamic Accretion onto a Rotating Black Hole" Astrophys.J.

Hirotani,K.：“旋转黑洞上磁流体动力吸积的时间变化”天体物理学.J。

Maezawa,K.: "Dependence of the Polar Rain Intensity on the Dawnーtodusk Component of the Convection Electric Field" Journal of Geophysical Research. (1992)

Maezawa, K.：“极地降雨强度对对流电场黎明至黄昏分量的依赖性”地球物理研究杂志（1992 年）。

Y.Uchida et al.: "A Magnetohydrodynamic Model for Herbig-Haro Objects:Magnetically Guided Shocked Flows Associated with Optical Jets from Young Stellar Objicts" Publ.Astron.Soc.Japan. 44. 227-243 (1992)

Y.Uchida 等人：“Herbig-Haro 天体的磁流体动力学模型：与年轻恒星天体光学射流相关的磁导冲击流”Publ.Astron.Soc.Japan。

Matsumoto,R.: "Three Dimensional Simulation of the Parker Instability" Publ.Astr.Soc.Japan. (1992)

Matsumoto,R.：“帕克不稳定性的三维模拟”Publ.Astr.Soc.Japan。