An investigation of the structure of rotational discontinuities
An investigation of the structure of rotational discontinuities
复制标题
旋转不连续结构的研究
DOI：
10.1029/90gl02436
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
P. Cargill
中科院分区：
文献类型：
--
作者：
C. Goodrich;P. Cargill
The structure of rotational discontinuities (RDs) has been studied through hybrid simulations for a range of propagation angle {Theta}{sub bn} between the discontinuity normal and the upstream magnetic field and plasma {beta}. For sufficiently narrow initial states, the simulations produce quasi-steady reverse rotation magnetic field structures for 30{degree} {le} {Theta}{sub bn} {le} 60{degree} and 0 < {beta} {le} 1 on a time scale of roughly 200 {Omega}{sub i}{sup {minus}1}. This structure is characterized by a right handed field rotation upstream joined smoothly to a left handed field rotation downstream; its width decreases from 60-70 c/{omega}{sub pi} at {Theta}{sub bn} = 30{degree} to less than 25 c/{omega}{sub pi} at {Theta}{sub bn} = 60{degree}. The magnetic field hodograms of the RD results have a distinctive S-shape which is most pronounced in simulations with small {Theta}{sub bn} and initially right handed rotations. The reverse rotation structure is the net result of the expansion of the initial current layer via the fast and intermediate wave modes.
The structure of rotational discontinuities (RDs) has been studied through hybrid simulations for a range of propagation angle {Theta}{sub bn} between the discontinuity normal and the upstream magnetic field and plasma {beta}. For sufficiently narrow initial states, the simulations produce quasi-steady reverse rotation magnetic field structures for 30{degree} {le} {Theta}{sub bn} {le} 60{degree} and 0 < {beta} {le} 1 on a time scale of roughly 200 {Omega}{sub i}{sup {minus}1}. This structure is characterized by a right handed field rotation upstream joined smoothly to a left handed field rotation downstream; its width decreases from 60-70 c/{omega}{sub pi} at {Theta}{sub bn} = 30{degree} to less than 25 c/{omega}{sub pi} at {Theta}{sub bn} = 60{degree}. The magnetic field hodograms of the RD results have a distinctive S-shape which is most pronounced in simulations with small {Theta}{sub bn} and initially right handed rotations. The reverse rotation structure is the net result of the expansion of the initial current layer via the fast and intermediate wave modes.