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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Flows, Fields, and Forces in the Mars-Solar Wind Interaction
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Flows, Fields, and Forces in the Mars-Solar Wind Interaction

机译：流、字段和力量Mars-Solar风交互

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摘要

We utilize suprathermal ion and magnetic field measurements from the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission, organized by the upstream magnetic field, to investigate the morphology and variability of flows, fields, and forces in the Mars-solar wind interaction. We employ a combination of case studies and statistical investigations to characterize the interaction in both quasi-parallel and quasi-perpendicular regions and under high and low solar wind Mach number conditions. For the first time, we include a detailed investigation of suprathermal ion temperature and anisotropy. We find that the observed magnetic fields and suprathermal ion moments in the magnetosheath, bow shock, and upstream regions have observable asymmetries controlled by the interplanetary magnetic field, with particularly large asymmetries found in the ion parallel temperature and anisotropy. The greatest temperature anisotropies occur in quasi-perpendicular regions of the magnetosheath and under low Mach number conditions. These results have implications for the growth and evolution of wave-particle instabilities and their role in energy transport and dissipation. We utilize the measured parameters to estimate the average ion pressure gradient, J × B, and v × B macroscopic force terms. The pressure gradient force maintains nearly cylindrical symmetry, while the J × B force has larger asymmetries and varies in magnitude in comparison to the pressure gradient force. The v × B force felt by newly produced planetary ions exceeds the other forces in magnitude in the magnetosheath and upstream regions for all solar wind conditions.
机译：我们利用suprathermal离子和磁场从火星大气和测量挥发性进化(MAVEN)任务,组织上游磁场,调查形态学和可变性的流动、字段和部队在Mars-solar风交互。采用案例研究和统计调查”来形容quasi-parallel和交互quasi-perpendicular地区和在高太阳风低马赫数条件。第一次,我们包括一个详细的调查suprathermal离子温度和各向异性。我们发现观察磁场和磁鞘suprathermal离子的时刻,弓形激波,上游地区可见不对称控制的星际磁场,特别大不对称的离子温度平行和各向异性。各向异性现象发生在quasi-perpendicular地区磁鞘和低马赫数下条件。波粒的增长和发展不稳定和他们的角色在能源运输和耗散。参数估计的平均离子压力梯度,J×B,和v×B宏观力量条款。近圆柱对称,J×B力有较大的不对称和差异级相比,压力梯度力。行星离子超过其他部队磁鞘和上游的大小地区所有太阳风条件。

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