The Relationship Between Upward Propagating Atmospheric Gravity Waves and Ionospheric Irregularities During Solar Minimum Periods
The Relationship Between Upward Propagating Atmospheric Gravity Waves and Ionospheric Irregularities During Solar Minimum Periods
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DOI：
10.1029/2021sw002715
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发表时间：
2021-10
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影响因子：
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通讯作者：
E. B. Seba;M.N. Gereme;N. M. Giday;M. Moldwin
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文献类型：
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作者：
E. B. Seba;M.N. Gereme;N. M. Giday;M. Moldwin
本文研究了向上传播的重力波与电离层不规则性之间的关系。重力波（GW）的热层电离层中间层能量学和动力学（TIMED）卫星温度测量和夜间电离层不规则性观测从三个Swarm卫星。使用这两组独立的测量数据，我们研究了2018-2019年春分和夏至季节重力波和电离层不规则性之间的关系。结果表明，日落后重力波特征对于了解全球夜间赤道等离子体密度不规则性的变化非常重要。我们还发现，午夜前和午夜后的电离层不规则性的特征表明，全球向西移的电离层不规则性的发生。向上传播的重力波纵向上也表现出三个主要峰值，最强的是美洲和非洲纵向扇区之间。最强的重力波振幅与最强的等离子体不规则性有关。在我们的观测中，在赤道附近的平流层顶区域观察到GW抑制，这是许多研究中在极地和高纬度地区经常观察到的。我们还观察到，电离层的不规则性是最强的GWs时，相对较少的抑制。
We present a study on the relationship between upward propagating gravity waves and ionospheric irregularities. Gravity waves (GWs) are identified from Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite temperature measurements and nighttime ionospheric irregularities are observed from the three Swarm satellites. Using these two independent set of measurements, we investigate the relationship between gravity waves and ionospheric irregularities on both equinox and solstice seasons for the years 2018–2019. The results show, post‐sunset gravity wave characteristics are important in understanding the variability of global nighttime equatorial plasma density irregularities. We also find out that the pre‐midnight and post‐midnight characteristics of ionospheric irregularities show global westward shift in the occurrence of ionospheric irregularities. Upward propagating gravity waves also show three dominant peaks longitudinally with the strongest being between American and African longitudinal sectors. Strongest gravity wave amplitudes are associated with strongest plasma irregularities. GW suppression is observed around equatorial regions at stratopause region in our measurements which are commonly observed at polar and higher latitudinal regions in many studies. We also observe that, ionospheric irregularities are strongest when GWs are relatively less suppressed.