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Nighttime D-region equivalent electron density determined from tweek sferics observed in the South Pacific Region

机译:根据在南太平洋地区观察到的t周铁素体测定的夜间D区等效电子密度

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Atmospherics or sferics that originate from lightning discharges on propagating large distances in the Earth-ionosphere waveguide, particularly at the night, form dispersed sferics called tweeks. Tweeks are novel diagnostic tool to monitor the nighttime D-region ionosphere. Mean equivalent electron density nem at mean tweek reflection heights hm and electron density profile have been estimated using the higher harmonic tweeks recorded in the time between 21-03 hrs LT at Suva (18.2°S, 178.3°E), Fiji, during a period March-December 2006. The values of nem vary from 29-170 cm-3 in the altitude range of about 3.5 km at hm of about 83 km. In terms of usually used exponential electron density profile, the ionospheric reference height and the exponential sharpness factor are calculated to be 83.1 km and 0.64 km-1, respectively. The scale height is calculated to be 1.9 km. Equivalent electron density profile of the nighttime lower ionosphere, using tweek method, shows lower values of electron density by about 20-45% than those obtained from the IRI-2001 model.
机译:源自地球电离层波导中较远距离的雷电放电产生的大气或铁素体,特别是在夜间,形成了称为tweek的分散铁素体。 Tweeks是监视夜间D区电离层的新型诊断工具。使用在斐济Suva(18.2°S,178.3°E)的LT 21-03 hrs LT之间的一段时间内记录的较高谐波tweek,估算了平均t周反射高度hm和电子密度分布下的平均等效电子密度nem 2006年3月至12月。nem的值在约3.5 km的高度范围(约83 km)中在29-170 cm-3之间变化。根据通常使用的指数电子密度分布,电离层参考高度和指数清晰度系数分别计算为83.1 km和0.64 km-1。标尺高度计算为1.9 km。使用tweek方法,夜间下部电离层的等效电子密度分布图显示,其电子密度值比从IRI-2001模型获得的值低约20-45%。

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