A joint investigation was conducted of coherent backscatter radar observations of irregularities within the E and F regions and tomographic mapping of corotating plasmaspheric irregularities (CPIs) near Japan and the American northwest from June 2018. Within both areas, the amplitudes/detection rates for CPIs associated with ionospheric phase fronts aligned northwest‐to‐southeast peaked at night, predominantly premidnight. Likewise, the line‐of‐sight velocity dispersion measured within the E region from coherent backscatter in both areas peaked during the same time periods. Additionally, there were several instances of southwest propagating phase fronts within the E region backscatter data, with speeds ∼100 m s⁻¹ and wavelengths ∼300 km. Both the CPI amplitudes and E region velocity dispersions were typically larger near Japan. In both geographic areas, detections of sporadic E (E_S) were prevalent during all times, as is typical at midlatitudes in northern summer. Such southwestward propagating phase fronts have often been observed within summer nighttime E_S layers and have been tied to electrobuoyancy waves in the F region. Simulations of plane wave electric field disturbances within E_S layers with amplitudes constrained by the backscatter velocity dispersion measurements were able to reproduce the observed CPI properties. These simulated disturbances had smaller wavelengths (50 km) and speeds (20 m s⁻¹) than those observed within the backscatter data but had similar oscillation periods. This may imply a population of smaller‐scale wave‐like disturbances that contribute significantly to the observed velocity dispersion but are too small to be resolved within the radar data.

中文翻译：

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零星E与等离子层之间电动力学联系的观察

从2018年6月开始，我们进行了联合调查，对E和F区域内的不规则现象进行了相干后向散射雷达观测，并对日本和美国西北部附近的同向旋转的等离子层不规则现象（CPI）进行了层析成像。在这两个区域内，与CPI相关的振幅/检测率电离层相位前锋在西北向东南对齐，并在夜间达到峰值，主要是午夜。同样，在E区域内两个区域的相干后向散射测得的视线速度色散在相同时间段达到峰值。另外，在E区反向散射数据中，有西南传播相前锋的一些实例，速度约为百米小号^-1和波长〜 300公里。在日本附近，CPI幅度和E区速度分散通常都较大。在这两个地理区域中，零星E（E _S）的检测一直很普遍，这是北部夏季中纬度地区的典型情况。这种西南向传播的相前锋经常在夏季夜间的E _S层内观察到，并与F区的电浮力波有关。E _S内平面波电场扰动的模拟振幅受到反向散射速度色散测量限制的层能够重现观察到的CPI属性。这些模拟扰动的波长（50 km）和速度（20 m s ^-1）比在反向散射数据中观察到的要小，但具有相似的振荡周期。这可能意味着存在较小规模的波状干扰，这些干扰对观测到的速度色散有很大贡献，但由于太小而无法在雷达数据中解决。