ROTI計算策略的初步分析比較
[Abstract]:Amplitude scintillation index S4 and phase scintillation exponent 蟽? Is the most commonly used parameter in ionospheric scintillation, The correlation between the ionospheric TEC variability index (Rate of TEC Index) and the S4 index obtained from the dual-frequency GNSS (Global Navigation Satellite system) receiver has been verified by many relevant studies that ROTI is also an effective parameter in ionospheric scintillation. This makes it possible to study ionospheric scintillation using a large number of globally distributed GNSS observations. However, the sampling rate and the calculation interval of the data used to calculate ROTI are different in different studies, and the choice of calculation strategy is not conclusive. Using the GNSS dual-frequency data of 15 s and 30 s sampling rate in Sanya, Hainan, and the S4 index obtained by ionospheric scintillation and TEC monitor, the correlation between various ROTI and S4 index obtained by different calculation strategies during the occurrence of ionospheric scintillation is analyzed. The sensitivity of several classes of ROTI to ionospheric scintillation was analyzed and compared. The results show that all kinds of ROTI have strong correlation with S4 exponent. In most cases, different types of ROTI can respond to the change of S4 exponent during the occurrence of scintillation, and the ROTI with different sampling rate can respond to the change of S4 exponent. The threshold of ionospheric scintillation event is different. Because of the different mechanism of monitoring ionospheric scintillation by ROTI and S4 index, several parameters can not reflect the ionospheric disturbance at the same time, so the ionospheric scintillation monitoring is carried out. In forecasting and early warning, it is suggested that multiple parameters should be used for comprehensive analysis at the same time. Under the same ionospheric condition, the ROTI of 15 s and 30 s sampling rates is relatively close, but both are obviously less than the ROTI of 1 s sampling rate. For ionospheric scintillation observations using GNSS receivers, GNSS observations with a sampling rate above 1 s are recommended.
【作者單位】: 中國科學院上海天文臺;中國科學院大學;
【基金】:國家重點研發(fā)計劃(2016YFB0501503-3) 國家自然科學基金項目(41730108)資助
【分類號】:P228.4
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