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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Conditions at the expanded Jovian magnetopause and implications for the solar wind interaction
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Conditions at the expanded Jovian magnetopause and implications for the solar wind interaction

机译：扩大了木星的磁层和条件对太阳风相互作用的影响

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摘要

Using idealized models of the magnetosheath and magnetosphere magnetic fields, plasma densities, and plasma flow, we test for the steady state viability of processes mediating the interaction between the solar wind and the Jovian magnetosphere. The magnetopause is modeled as an asymmetric paraboloid with variable asymmetry. The subsolar standoff of the magnetopause has been shown to exhibit a bimodal probability distribution (Joy et al., 2002). Only the expanded magnetopause is considered, with a standoff of ?90 RJ. We test where on the magnetopause surface large-scale reconnection may be affected by either a shear flow or diamagnetic drift due to a pressure gradient across the magnetopause boundary. We also test for the onset of the Kelvin-Helmholtz instability. We find that reconnection is inhibited on the dawn flank due to the large shear flows in this region, regardless of magnetopause shape or interplanetary magnetic field orientation. The presence of a high energy plasma population in the magnetosphere may inhibit reconnection over much of the magnetopause area, except when the fields are antiparallel. Additionally, most of the dawn flank of the magnetopause is Kelvin-Helmholtz unstable, regardless of magnetopause asymmetry; and the dusk flank tailward of the planet is Kelvin-Helmholtz unstable when the magnetopause is highly oblate.
机译：使用磁鞘和理想化的模型磁气圈的磁场,等离子体密度,等离子体流,我们测试的稳定状态可行性的过程协调交互太阳风和木星之间磁气圈。不对称不对称抛物面与变量。磁层的现世的僵局表现出双峰概率分布(欢乐et al ., 2002)。扩大磁层被认为是,90 RJ对峙的?。磁层表面大规模重新连接受剪切流或抗磁性由于对面的压力梯度漂移磁层边界。Kelvin-Helmholtz的不稳定。重新连接上抑制黎明旁边这个地区的大型剪切流,无论磁层或形状行星际磁场取向。高能等离子人口的存在磁气圈可能抑制重新连接的磁区,除了当字段是反平行的。黎明磁层的侧面Kelvin-Helmholtz稳定,不管磁层不对称;地球tailward Kelvin-Helmholtz不稳定时,磁层高度扁。

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