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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Impacts of atmospheric ultrafast Kelvin waves on radio scintillations in the equatorial ionosphere
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Impacts of atmospheric ultrafast Kelvin waves on radio scintillations in the equatorial ionosphere

机译：影响大气超快的开尔文波广播在赤道电离层闪烁

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摘要

We present a statistical analysis of the amplitudes of GPS scintillations (S4 index) observed throughout 2008-2010 using the satellite radio occultation measurements of the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC). Here, for the first time, periodic variability in the occurrence of S4 is investigated using these data. Significant variations of S4 with periods of 2.5-4 days (quasi-3 days) are identified from the observations during postsunset hours (1900-2400 local time) between 15°S- 15°N magnetic latitude during this 3 year interval. Coherence analyses of these variations with the geomagnetic Ap index, solar EUV irradiance, and atmospheric wind measurements from an equatorial mesosphere meteor radar at Thumba, India (8.5°N, 77°E) are performed, providing a measure of the relationship between variations in the scintillations and potential drivers. The quasi-3 day variations in S4 are found to covary with the variations of the three drivers examined. In particular, the S4 signatures are found to be coherent with the atmospheric ultrafast Kelvin (UFK) planetary waves characterized by the zonal wind measurements of the radar. This study shows that these UFK waves are as important as the solar and geomagnetic drivers in forcing the day-to-day variations of the occurrence of equatorial spread F.
机译：我们报告的统计分析全球定位系统(GPS)的振幅闪烁(S4指数)在2008 - 2010年使用卫星观测到的无线电掩星的测量星座为气象观测系统,电离层和气候(宇宙)。第一次,周期性变化的发生的S4是使用这些调查数据。2.5 4天(quasi-3天)进行标识在postsunset时间的观察当地时间(1900 - 2400)15°S - 15°N在这3年时间间隔磁纬度。相干分析的这些变化美联社地磁指数、太阳能EUV辐照度从赤道大气风速测量在Thumba中间层流星雷达,印度(8.5°N,77°E)执行,提供了一个衡量的的变化之间的关系闪烁和潜在的司机。一天变化S4发现共变的变化的三个司机检查。发现特别S4签名与大气相干超速开尔文由纬向(UFK)行星波的特征风测量雷达。这些UFK波一样重要太阳能和地磁在迫使司机日常发生的变化赤道扩展F。

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