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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Magnetosheath Reconnection Before Magnetopause Reconnection Driven by Interplanetary Tangential Discontinuity: A Three-Dimensional Global Hybrid Simulation With Oblique Interplanetary Magnetic Field
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Magnetosheath Reconnection Before Magnetopause Reconnection Driven by Interplanetary Tangential Discontinuity: A Three-Dimensional Global Hybrid Simulation With Oblique Interplanetary Magnetic Field

机译：磁鞘重新连接之前的磁重新连接由星际切线不连续面:一个三维全球混合动力车与斜行星际磁场仿真场

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摘要

Terrestrial dayside dynamics associated with a southward turning, oblique interplanetary magnetic field (IMF) carried by an interplanetary tangential discontinuity (TD) is investigated by performing a three-dimensional global-scale hybrid simulation systematically for cases in which the incoming solar wind TD possesses various magnetic field rotation angles ΔΦ = 90° to 180° and half widths w = 2d_(i0) to w = 30d_(i0), where d_(i0) is the ion inertial length in the solar wind. Overall, the TD is compressed while being transmitted into the magnetosheath, with different compression processes downstream of the quasi-parallel (Q-||) and quasi-perpendicular (Q-⊥) shocks. It is found that magnetosheath reconnection may take place downstream of both the Q-|| and Q-⊥ shocks due to interaction of the directional TD with the bow shock and magnetopause, but the existence of magnetosheath reconnection depends on w and ΔΦ. Magnetosheath flux ropes are formed through three-dimensional patchy reconnection in the thinned current sheet, with a longer rope lengths under a larger ΔΦ. There exists a dawn-dusk asymmetry in the spatial extent of the flux ropes, which becomes more significant as ΔΦ decreases. When ΔΦ decreases to 90°, no reconnection flux ropes are found. Magnetopause reconnection is initiated when the magnetic fluxes with a southward turning IMF (on the sunward side) reach the magnetopause, and the magnetopause flux ropes can be mixed with the magnetosheath ones. Our simulation demonstrates that the effects of a southward turning of the IMF may not be a simple field direction change that leads to reconnection only at the magnetopause.
机译：陆地的光面动力学有关向南转,斜行星际行星际磁场(IMF)进行的切向间断(TD)的调查执行三维全球范围内混合模拟系统为例传入的太阳风TD拥有各种磁场旋转角度ΔΦ= 90°到180°半宽度w = 2 d_(钱数)w =30 d_(钱数),d_(钱数)是离子惯性长度在太阳风。虽然被传播到磁鞘,与下游不同的压缩过程quasi-parallel (Q - | |)和quasi-perpendicular (Q -⊥)冲击。磁鞘重联可能发生下游的Q - | |和Q -⊥冲击交互的定向TD弓震惊和磁层,但的存在磁鞘重新连接取决于w和ΔΦ。磁鞘通量绳形成重新连接在三维不完整的减少电流片,长绳子的长度下一个更大的ΔΦ。不对称的空间范围绳索,变得更重要ΔΦ减少。重新连接通量绳。重新连接磁时启动向南把国际货币基金组织(通量朝着太阳的一面)达到磁层,磁层通量绳可以混合磁鞘的。向南的效果的国际货币基金组织可能不是一个简单的磁场方向改变这只会导致重新连接的磁层。

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