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首页> 外文期刊>Annales Geophysicae >Quarterdiurnal signature in sporadic E occurrence rates and comparison with neutral wind shear
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Quarterdiurnal signature in sporadic E occurrence rates and comparison with neutral wind shear

机译:零星e发生率的四分之一尖签,与中性风剪的比较

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摘要

The GPS radio occultation (RO) technique is used to study sporadic E (Es) layer plasma irregularities of the Earth's ionosphere on a global scale using GPS signal-to-noise ratio (SNR) profiles from the COSMIC/FORMOSAT-3 satellite. The maximum deviation from the mean SNR can be attributed to the height of the Es layer. Es are generally accepted to be produced by ion convergence due to vertical wind shear in the presence of a horizontal component of the Earth's magnetic field, while the wind shear is provided mainly by the solar tides. Here we present analyses of quarterdiurnal tide (QDT) signatures in Es occurrence rates. From a local comparison with mesosphere/lower thermosphere wind shear obtained with a meteor radar at Collm (51.3° N, 13.0° E), we find that the phases of the QDT in Es agree well with those of negative vertical shear of the zonal wind for all seasons except for summer, when the QDT amplitudes are small. We also compare the global QDT Es signal with numerical model results. The global distribution of the Es occurrence rates qualitatively agrees with the modeled zonal wind shears. The results indicate that zonal wind shear is indeed an important driving mechanism for the QDT seen in Es.
机译:GPS无线电掩星(RO)技术用于使用来自宇宙/ Formosat-3卫星的GPS信噪比(SNR)型材的全球尺度研究地球电离层的散核e(ES)层等离子体。与平均SNR的最大偏差可以归因于ES层的高度。通常被认为是由于地球磁场的水平分量存在的垂直风剪切而被离子会聚产生的,而风剪主要由太阳潮汐提供。在这里,我们展示了ES发生率的季度潮汐潮(QDT)签名分析。从与Collm的流星雷达(51.3°N,13.0°E)的流星雷达获得局部比较(51.3°N,13.0°E),发现QDT的阶段与Zonal风的负垂直剪切的阶段很好地同意对于除夏季外的所有季节,当QDT幅度很小时。我们还将全局QDT ES信号与数值模型进行比较。 ES发生率的全球分布定性同意模型的Zonal风剪。结果表明,Zonal风剪是ES中看到的QDT的重要驱动机制。

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