Slow mode structure in the nightside magnetosheath related to IMF draping

N. V. Erkaev; C. J. Farrugia; A. V. MezentsevR. B. TorbertH. K. Biernat

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Slow mode structure in the nightside magnetosheath related to IMF draping

机译：阴面慢模式结构磁鞘与国际货币基金组织(IMF)隔音材料

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We apply a semianalytic magnetohydrodynamic approach to describe effects in the nightside magnetosheath related to accelerated magnetosheath flows caused by the draping of interplanetary magnetic field (IMF). Assuming a northward IMF direction, we show the development of slow mode fronts in the far tail (tailward of approximately ?60 R_mE). We find that accelerated flows north and south of the equator start to converge toward lower latitudes. The ensuing plasma compression gives rise to slow mode waves in the equatorial region which, further down the tail, evolve into slow mode shocks. These fronts propagating along the magnetic field lines are characterized by sharp increases of plasma density, pressure, and temperature and a decrease in the magnetic field strength. The magnetic pressure exhibits an anticorrelation with the plasma pressure, but the total pressure is fairly constant across the fronts. The field-aligned plasma velocity component anticorrelates with the plasma density, while the perpendicular velocity component does not have sharp variations at the fronts. For northward IMF, these fronts appear near the equatorial region and then propagate to higher latitudes. This effect is not very sensitive to the particular shape of the magnetopause. Lowering the upstream Alfvén Mach number increases the strength of the slow mode waves, which also develop closer to Earth. We predict that this effect can be observed by space probes skimming the far tail.

机译：我们应用一个semianalytic磁流体动力阴面的方法来描述效果磁鞘与加速磁鞘流覆盖造成的行星际磁场(IMF)。国际货币基金组织(IMF)向北方向,我们展示了发展缓慢的模式方面的尾巴(tailward约? 60 R_mE)。北部和南部的赤道开始流动对低纬度地区收敛。等离子体压缩产生慢波模式在赤道地区,进一步了尾巴,演变成慢模式的冲击。沿着磁力线是传播以等离子体的急剧增加密度、压力、温度和减少在磁场强度。展品的anticorrelation压力等离子体的压力,但总压强是相当恒定的整个领域。等离子体速度分量anticorrelates与等离子体密度,而垂直速度组件没有急剧的变化方面。在赤道附近地区,然后传播高纬度地区。敏感的特定形状磁层。数量增加缓慢的力量模式波,也开发接近地球。预测,这种效应可以被观察到的空间探针略读尾巴。

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来源
《Journal of Geophysical Research, A. Space Physics: JGR》 |2014年第2期|1121-1128|共8页
作者
N. V. Erkaev; C. J. Farrugia; A. V. MezentsevR. B. TorbertH. K. Biernat;
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作者单位

Siberian Federal University, Krasnoyarsk, Russia;

Space Research Institute, Austrian Academy of Sciences, Graz, Austria;

Space Science Center and Department of Physics, University of New Hampshire, Durham, New Hampshire, USAInstitute of ComputationalModeling SB RAS, Krasnoyarsk, Russia;

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equatorial region; Space probes; plasma densityplasma compressionmagnetosheathvelocity componentplasma pressure;

机译：赤道地区,太空探测器;等离子体densityplasma compressionmagnetosheathvelocitycomponentplasma压力;

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Slow mode structure in the nightside magnetosheath related to IMF draping

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