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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Influence of the Magnetic Field Strength and Solar Activity on the Thermospheric Zonal Wind
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Influence of the Magnetic Field Strength and Solar Activity on the Thermospheric Zonal Wind

机译：磁场强度的影响和太阳能活动在Thermospheric纬向风

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摘要

Based on Thermosphere-Ionosphere Electrodynamics General Circulation Model simulation and CHAllenging Minisatellite Payload observations, the effects of the geomagnetic field intensity and solar activity on the thermospheric zonal wind and related physical mechanisms are investigated. The weakening of the magnetic field results in an increase in the westward wind during the daytime and a decrease in the eastward wind at night, and leading to a decreasing superrotation. The weakening solar activity causes a reduction in the zonal wind and superrotation. The theoretical term analysis shows that when the magnetic field is weakened, the vertical upward drift velocity of the plasma increases, resulting in a decrease in the electron density in the F layer. The weakening of eastward acceleration of viscous force and ion drag results in an enhanced westward wind. The downward drift velocity of ions increases at night, resulting in an increase in the electron density, while the ion-neutral velocity difference decreases. The weakening of eastward acceleration of pressure gradient and viscous force at night are main reasons for the decreased eastward wind. The reduced solar activity leads to a decrease in the pressure gradient and ion drag. Combined with the change of viscous force, these processes cause the decrease in the superrotation. The geomagnetic field configuration is responsible for the UT variation (potential longitudinal change) in the superrotation. When the magnetic field is weakened, although the average neutral wind decreases, the Pedersen conductivity of the F-layer is quadrupled. Therefore, the meridional current system driven by the F-layer dynamo is enhanced accordingly.
机译：基于Thermosphere-Ionosphere电动力学仿真和环流模型挑战Minisatellite载荷观察,地磁场强度的影响和太阳活动thermospheric带状风和相关的物理机制调查。导致增加西部风在白天,减少向东晚上风,导致下降superrotation。纬向风和导致减少superrotation。表明,当磁场减弱,等离子体的垂直向上漂移速度增加,导致下降电离层电子密度。向东加速度的粘性力和离子阻力导致一个增强西部风。离子的向下漂移速度增加晚上,导致增加电子密度,而ion-neutral速度差异减少。加速压力梯度和粘性晚上力的减少是主要原因东方风。减少压力梯度和离子阻力。这些过程导致的减少superrotation。配置负责UT变异(潜在的纵向变化)superrotation。削弱,尽管平均中性风皮德森的电导率降低电离层是翻了两番。当前系统由电离层发电机相应的增强。

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