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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Enhancement and HF Doppler observations of sporadic-E during the solar eclipse of 22 July 2009
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Enhancement and HF Doppler observations of sporadic-E during the solar eclipse of 22 July 2009

机译：增强和高频多普勒观测结果在7月22日的日食分散e2009

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摘要

The sporadic E (Es) frequently emerging in midlatitude during summer is a very special layer in the ionosphere, and its formation mechanism is different to from that of other layers. The total solar eclipse of 22 July 2009 provided a very unique opportunity to study the relationship of Es and solar radiation. During the solar eclipse day and the days before and after, the vertical incidence ionosonde was located in Wuhan to record the ionograms for this event. Two oblique incidence high-frequency radio systems were used to record the waves from Wuhan to Suzhou and from Wuhan to Huaian. The enhancement of Es during the eclipse period was observed in the vertical and oblique incidence ionograms. The quasi-periodic fluctuations in the critical frequency and Doppler frequency shift curves indicated the possible existence of the gravity waves, which may be responsible for the Es enhancement. However, we find that the enhancement occurred earlier than the appearance of gravity waves and consider that there may be other mechanisms which contribute to the observed enhancement in the ionosphere. A hypothesis is put forward that the cooling effect of the lunar shadow induced powerful airflow from the northern and southern limits of the shadow toward its center, which accelerated the irregularities in Es to produce the large-scale Doppler shift in the reflected waves and form the meridional windshear. Both the windshear and the gravity waves may affect the Es layer and increase the electron concentration. Many observed phenomena are in accordance with this.
机译：分散E (Es)经常出现中间纬度在夏天是一个非常特殊的层在电离层,及其形成机制不同于其他层。日食的2009年7月22日提供了一个非常独特的机会来研究之间的关系Es和太阳辐射。一天,之前和之后的日子,垂直的发病率ionosonde位于武汉记录这个事件的电离图。发病率高频无线电系统记录从武汉到苏州,从海浪武汉淮安。隐蔽期垂直和观察倾斜入射电离图。在临界频率和波动多普勒频移曲线表示可能存在的重力波,可能负责Es增强。然而,我们发现,增强发生早于重力波的出现考虑到可能存在其他机制中观察到的增强电离层。冷却效果的月球阴影诱导强大的气流从北部和南部限制的影子对其中心加速了Es生产中的违规行为大规模的多普勒频移的反映海浪和形成经向风剪。风剪和重力波可能影响Es层,增加电子浓度。许多观测到的现象符合这一点。

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