On the Properties of and Ionospheric Conditions Associated With a Mid‐Latitude Scintillation Event Observed Over Southern United States
On the Properties of and Ionospheric Conditions Associated With a Mid‐Latitude Scintillation Event Observed Over Southern United States
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DOI：
10.1029/2021sw002744
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发表时间：
2021-06
期刊：
影响因子：
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通讯作者：
F. Rodrigues;J. Socola;A. Moraes;C. Martinis;D. Hickey
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作者：
F. Rodrigues;J. Socola;A. Moraes;C. Martinis;D. Hickey
虽然低纬和高纬电离层闪烁已被广泛报道，但有关中纬电离层闪烁的特性和导致中纬电离层闪烁的条件的信息却少得多。在这里，我们报告并讨论了2013年6月1日在美国南部（UT达拉斯，32.99°N，96.76°W，43.2°N倾角纬度）进行的闪烁观测。这些测量是由一个专门的双频GPS闪烁监测器进行的，它使我们能够确定这个中纬度闪烁事件的主要属性。此外，同时进行的气辉观测和电离层总电子含量图提供了对导致观测到的电离现象的条件的深入了解。L1和L2C信号均出现中等幅度的倾斜（S4> 0.4），L2C信号在低仰角（<30°）时出现严重（S4 > 0.8）事件。相位闪烁伴随着幅度衰减，在L2C中最大σ_（max）值超过0.5弧度。我们还表明，所观察到的相位闪烁幅度增加幅度闪烁的严重程度。去相关时间大多在0.25和1.25 s之间，L1和L2C的平均值约为0.65 s。S4的频率标度与弱散射理论的预测相当匹配，但也适用于中等和强振幅闪烁的观测。闪烁发生在一场中等磁暴的主阶段，然而，这促使中纬度槽极端地向赤道移动，并在美国上空产生了大的背景TEC增强。闪烁，但是，发生在TEC和气辉耗尽观察得克萨斯州。最后，闪烁特性（包括严重性和快速性）以及相关的TEC特征与赤道扩展F相关的特征相当。
While low and high‐latitude ionospheric scintillation have been extensively reported, significantly less information is available about the properties of and conditions leading to mid‐latitude scintillations. Here, we report and discuss scintillation observations made in the Southern United States (UT Dallas, 32.99°N, 96.76°W, 43.2°N dip latitude) on June 1st, 2013. The measurements were made by a specialized dual‐frequency GPS‐based scintillation monitor which allowed us to determine main properties of this mid‐latitude scintillation event. Additionally, simultaneous airglow observations and ionospheric total electron content (TEC) maps provided insight on the conditions leading to observed scintillations. Moderate amplitude scintillations (S4>∼0.4) occurred in both L1 and L2C signals, and severe (S4 > ∼0.8) events occurred in L2C signals at low (<30°) elevation angles. Phase scintillation accompanied amplitude fadings, with maximum σϕ values exceeding 0.5 radians in L2C. We also show that the observed phase scintillation magnitudes increased with amplitude scintillation severity. Decorrelation times were mostly between 0.25 and 1.25 s, with mean value around 0.65 s for both L1 and L2C. Frequency scaling of S4 matched fairly well the predictions of weak scattering theory but held for observations of moderate and strong amplitude scintillation as well. Scintillation occurred during the main phase of a modest magnetic storm that, nevertheless, prompted an extreme equatorward movement of the mid‐latitude trough and large background TEC enhancements over the US. Scintillations, however, occurred within TEC and airglow depletions observed over Texas. Finally, scintillation properties including severity and rapidity, and associated TEC signatures are comparable to those associated with equatorial spread F.