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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >The Impact of Radial and Non-Radial IMF on the Earth's Magnetopause Size, Shape, and Dawn-Dusk Asymmetry From Global 3D Kinetic Simulations
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The Impact of Radial and Non-Radial IMF on the Earth's Magnetopause Size, Shape, and Dawn-Dusk Asymmetry From Global 3D Kinetic Simulations

机译：径向和放射国际货币基金组织(IMF)的影响地球磁层的大小、形状和Dawn-Dusk不对称从全球三维动态模拟

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摘要

The boundary between the solar wind and the Earth's magnetosphere, the magnetopause (MP), is highly dynamic. Its location and shape depend on SW dynamic pressure and interplanetary magnetic field (IMF) orientation. We use a 3D kinetic Particle-In-Cell code (IAPIC) to simulate an event observed by THEMIS spacecraft on July 16, 2007. We investigate the impact of raEdial (θ_(Bx) = 0° ) and non-raEdial (θ_(Bx) = 50° ) IMF on the shape and size of Earth's MP for a dipole Etilt of 31° using maximum density gradient and pressure balance methods. UsinEg the Shue model as a reference (MP at 10.3 R_E ), we find that for non-radial IMF the MP expands by 1.4 and 1.7 R_E along the Sun-Earth (OX) and tilted magnetic equatorial (Tilt) axes, respectively, and it expands by 0.5 and 1.6 R_E for radial IMF along the same respective axes. When the effect of backstreaming ions is removed from the bulk flow, the expansion ranges are 1.0 and 1.3 R_E and 0.2, and 1.2 R_E, respectively. It is found that the percentage of backstreaming to bulk flow ions are 16.5% and 20% for radial and non-radial IMF. We also show that when the backstreaming ions are not identified, up to 40% of the observed expansion that is due to backstreaming particles can be inadvertently attributed to a change in the SW upstream properties. Finally, we quantified the temperature anisotropy in the magnetosheath, and observe a strong dawn-dusk asymmetry in the MP location, being more extended on the duskside than on the dawnside.
机译：太阳风和之间的边界地球的磁气圈,磁层(MP)高度动态。SW动态压力和行星际磁场字段(IMF)方向。Particle-In-Cell (IAPIC)来模拟一个代码事件观察到THEMIS计划7月16日,2007. (θ(_)= 0°Bx) and non-raEdial(θ(_)= 50°Bx)国际货币基金组织(IMF)在地球的形状和大小的议员偶极子Etilt 31°使用最大密度梯度和压力平衡方法。Shue模型作为参考在10.3 R_E (MP),我们发现放射IMF议员展开的1.4和1.7 R_E一起来观察太阳-地球(牛)和倾斜的磁赤道(倾斜)轴,分别由0.5和1.6 R_E膨胀对径向IMF同时各自的轴。当回流离子的影响从整体流、扩张范围是1.0R_E 1.3和0.2和1.2 R_E,分别。结果表明,回流的百分比整体流离子是径向的16.5%和20%和国际货币基金组织放射。逆流离子并不确定,高达40%由于观察的扩张逆流粒子可以不经意间归因于SW上游的改变属性。温度各向异性磁鞘观察一个强大dawn-dusk议员不对称duskside位置,更加扩展而不是dawnside。

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