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首页> 外文期刊>Geophysical Research Letters >Kinetic instabilities in Mercury's magnetosphere: Three-dimensional simulation results
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Kinetic instabilities in Mercury's magnetosphere: Three-dimensional simulation results

机译：水星磁层的动力学不稳定性：三维模拟结果

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摘要

A self-consistent global three-dimensional kinetic study of Mercury's magnetosphere is carried out examining waves and instabilities generated by ion temperature anisotropy and plasma flow. The overall structure of Mercury's upstream bow shock and magnetosheath are qualitatively very similar to those of Earth. Beam-generated long-wavelength oscillations are present upstream of Mercury's quasi-parallel bow shock, whereas large-amplitude mirror waves develop downstream of the quasi-parallel bow shock in the magnetosheath. A train- of mirror waves forms also downstream of the quasi-perpendicular bow shock. A velocity shear near the magnetopause can lead to formation of vortex-like structures. The magnetospheric cavity close to the planet's equatorial plane is filled with ions much hotter than the solar wind protons. A drift-driven plasma belt close to the equator is present in the model and contains plasma with high-temperature anisotropy, and the loss cone for charged particles in this region is large. The belt may cause diamagnetic effects superimposed on the planet's internal magnetic field and can interact with Mercury's magnetopause.
机译：对汞的磁层进行了自洽的全局三维动力学研究，研究了离子温度各向异性和等离子体流产生的波和不稳定性。水星上游弓形冲击和磁石震荡的整体结构在质量上与地球非常相似。光束产生的长波振荡出现在水星准平行弓形激波的上游，而大幅镜面波则在磁石中准平行弓形激波的下游产生。准垂直弓形冲击的下游也形成一连串的反射波。磁层顶附近的速度剪切会导致形成漩涡状结构。靠近行星赤道平面的磁层空腔中充满的离子比太阳风质子热得多。该模型中存在靠近赤道的漂移驱动等离子体带，其中包含具有高温各向异性的等离子体，并且该区域中带电粒子的损耗锥很大。该传送带可能引起叠加在行星内部磁场上的反磁效应，并且可能与水星的磁致幻影相互作用。

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