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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Effects of the IMF Direction on Atmospheric Escape From a Mars-like Planet Under Weak Intrinsic Magnetic Field Conditions
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Effects of the IMF Direction on Atmospheric Escape From a Mars-like Planet Under Weak Intrinsic Magnetic Field Conditions

机译：国际货币基金组织方向对大气的影响逃跑从类火星行星撞击后在弱的内在磁场条件下

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摘要

Direction of the upstream interplanetary magnetic field (IMF) significantly changes the magnetospheric configuration, influencing the atmospheric escape mechanism. This paper investigates effects of IMF on the ion escape mechanism from a Mars-like planet that has a weak dipole magnetic field directing northward on the equatorial surface. The northward (parallel to the dipole at subsolar), southward (antiparallel), and Parker-spiral IMFs under present solar wind conditions are compared based on multispecies magnetohydrodynamics simulations. In the northward IMF case, molecular ions escape from the high-latitude lobe reconnection region, where ionospheric ions are transported upward along open field lines. Atomic oxygen ions originating either in the ionosphere or oxygen corona escape through a broader ring-shaped region. In the southward IMF case, the escape flux of heavy ions increases significantly and has peaks around the equatorial dawn and dusk flanks. The draped IMF can penetrate into the subsolar ionosphere by erosion, and the IMF becomes mass-loaded as it is transported through the dayside ionosphere. The mass-loaded draped IMF is carried to the tail, contributing to ion escape. The escape channels in the northward and southward IMF cases are different from those in the Parker-spiral IMF case. The escape rate is the lowest in the northward IMF case and comparable in the Parker-spiral and southward IMF cases. In the northward IMF case, a weak intrinsic dipole forms a magnetosphere configuration similar to that of Earth, quenching the escape rate, while the Parker-spiral and southward IMFs cause reconnection and erosion, promoting ion escape from the upper atmosphere.
机译：上游的行星际磁场方向字段(IMF)显著地改变了磁性层的配置,影响大气逃逸机制。调查的影响,国际货币基金组织(IMF)在离子逃逸机制从类火星行星撞击后疲软偶极子磁场指挥上向北赤道的表面。在现世的偶极子),向南(反平行的)和Parker-spiral货币基金现在太阳风条件比较的基础在multispecies磁流体动力学模拟。在北方国际货币基金组织(IMF)的情况下,分子离子逃跑从高纬度叶重新连接,电离层离子运输向上在哪里沿着电场线。原始电离层或氧气通过更广泛的环形电晕逃脱地区。沉重的离子通量显著增加,山峰在赤道黎明和黄昏吗侧翼。现世的电离层的侵蚀,国际货币基金组织成为mass-loaded是运输的光面电离层。国际货币基金组织进行的尾巴,导致离子逃跑。南国际货币基金组织(IMF)情况下不同于那些IMF Parker-spiral情况。在北方国际货币基金组织(IMF)的情况下,最低可比Parker-spiral和国际货币基金组织向南用例。固有偶极子形成一个磁场配置与地球相似,淬火越狱率,而Parker-spiral和向南首先引起重新连接和侵蚀,促进离子逃离高层大气。

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