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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Simulation of the sporadic E layer response to prereversal associated evening vertical electric field enhancement near dip equator
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Simulation of the sporadic E layer response to prereversal associated evening vertical electric field enhancement near dip equator

机译：分散E层响应的模拟prereversal晚上垂直电有关场增强磁赤道附近

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摘要

The role of the molecular and metallic ions in the formation of sporadic E layers (Es layers) has been an active area of research for many years. Ionosonde data of the Es layer parameter, fbEs (the blanketing frequency of sporadic layer), and ftEs (the top frequency of Es trace), obtained over the Brazilian sites, Fortaleza, and S?o Luis, show that the diurnal variations of these parameters often present a disruption that is coincident with the evening prereversal electric field/vertical drift enhancement, to reappear after about 2 hours. In this work we have developed a model of the E region with the objective to describe all the phases of the life cycle of the sporadic layer and its relation to the evening vertical electric field enhancement that is associated with the development of the prereversal zonal electric field enhancement. The model calculates the densities of NO+, O2 +, O+, N2 +, and Fe+ in the height region 86–140 km by simultaneously solving the continuity and momentum equations for each of the species. For low latitudes this model shows that winds and electric fields each play distinct roles in the vertical transport of plasma leading to Es layer formation. The results of our numerical simulation confirm the dominant role of the vertical electric field as the cause of the inhibition/disruption of the sporadic layer in the evening. More specifically, the results reveal that an upward directed (positive) vertical electric field is capable of disrupting an ongoing sporadic layer, whereas a downward (negative) electric field favors its formation or even intensification, thus corroborating the conclusions of the recent study by Abdu et al. (2003).
机译：分子和金属离子的作用形成分散E层(Es层)一个活跃的研究领域已有多年。Ionosonde Es层的数据参数,fb(零星的覆盖频率层)招聘(Es的最高频率跟踪)在巴西网站,福塔雷萨,年代?路易斯,显示的昼夜变化参数经常出现中断重合的晚上prereversal电气字段/垂直漂移增强,重新出现大约2个小时。开发了一个模型的E地区目的描述生命的所有阶段零星的层及其关系的循环晚上垂直电场增强与发展相关联prereversal区域电场增强。模型计算的密度没有+ O2 + O +,N2 +高度地区和铁+ 86 - 140公里同时解决连续性和为每一个物种的动量方程。低纬度地区这个模型表明,风和电场中的每个扮演不同的角色等离子体导致Es层的垂直运输形成。仿真证实的主导作用垂直电场的原因抑制/零星的层的破坏傍晚。显示一个向上直接(正面)垂直电场干扰的能力正在进行零星的层,而向下(负面)电场对其形成或甚至加剧,因此确凿最近的研究结论阿卜杜勒et al。(2003).

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