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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Ionospheric D Region Parameters Obtained Using VLF Measurements in the South Pacific Region
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Ionospheric D Region Parameters Obtained Using VLF Measurements in the South Pacific Region

机译：使用甚低频电离层D地区获得的参数在南太平洋地区的测量

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摘要

The diurnal variations in the phase and amplitude of very low frequency (VLF) transmissions with the call signs NWC, NPM, and NLK, received at Suva, Fiji, have been modeled using the Long Wave Propagation Capability (V2.1) code to determine the ionospheric D region parameters, H? (reference height), and β (rate of increase of electron density with height), for different daytime and nighttime conditions along the transmitter-receiver great circle paths (TRGCPs). Measured VLF signal amplitude and phase show explicit variation over the day and nighttime along a TRGCP, also revealing amplitude minima and phase steps during sunrise and sunset as the day/night terminator traverses a TRGCP. While the daytime signal strength is reasonably smooth, at nighttime, the signal exhibits a great deal of variability. For three signal paths, the mean daytime H? and β were found to be 70.7 km and 0.40 km?1, respectively, while nighttime mean values of these parameters were found to be 84.2 km and 0.68 km-1, respectively. The temporal and day-to-day variability of the nighttime D region parameters shows that H? and β ranges in between 83.0 and 85.0 km and 0.58 and 0.80 km?1, respectively. One of the possible sources of nighttime signal variability is increase in the number of modes propagating and relative complex interference between them along the TRGCPs, whereby the weaker modes also become significant at night due to reduced attenuation. In addition, the variations in the nighttime D region may also be a cause of high signal variability.
机译：的昼夜变化相位和振幅非常低的频率(甚低频)传输调用NWC迹象,NPM, NLK收到斐济苏瓦,一直使用长波建模传播能力(V2.1)代码来确定电离层D区域参数,H ?(参考高度)和β(的增加速度电子密度随高度),为不同在日间和夜间条件收发两用机大圆路径(TRGCPs)。甚低频信号振幅和相位测量天,夜间明确的变化沿着TRGCP也揭示振幅最小值和相位的步骤在日出日落白天/黑夜终结者TRGCP遍历。白天信号强度相当光滑,夜间,展示大量的信号可变性。白天H ?0.40公里吗?这些参数的值是84.20.68公里,km-1分别。日常夜间D地区的可变性参数表明,H ?83.0和85.0公里和0.58和0.80公里吗?分别。夜间信号变化增加传播的模式和相对复杂沿着TRGCPs它们之间的干扰,,较弱的模式也变得重要晚上由于减少衰减。夜间D地区也可能变化是一个高信号变化的原因。

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