Abstract
Abstract GPS L-band scintillations and total electron content (TEC) were recorded at Sanya (18.33°N, 109.52°E) during the period July 2004–July 2005. Automatic recorded raw digital scintillation data are analyzed to obtain the spectral characteristics of irregularities producing ionospheric scintillations and to estimate the correlation between amplitude scintillation and power spectral density. Concurrent measurements of TEC are used to analyze ROTI, defined as the standard deviation of the rate of change of TEC. The statistical results of S4 indices and power spectral indices indicate that the power spectral indices increase with S4 indices for weak scintillation (0.1 ≤ S4 < 0.3), but for moderate and strong scintillation, spectral indices tend to be saturated. In the analyzed data set, the ratio of ROTI/S4 is found to vary between 0.3 and 6, and the variation in estimated zonal drift velocities during geomagnetic quiet days (K p < 3) shows that the motion of the irregularities is highly variable in the initial phase of irregularity development. After about 22:00 LT, the estimated drift velocities tend to follow the same pattern.
Highlights
Ionospheric scintillation is a relatively rapid fluctuation of the amplitude phase of the radio signal and is mostly caused by irregularities in the ionospheric electron density along the path that the signal propagated
Employing the ROTI value, S4 index and estimated irregularity spectral index as the means of analyzing the total electron content (TEC) fluctuations, we have studied the spectral characteristics and transverse drift velocities of the scintillation-producing irregularities, the evolution of large- and small-scale irregularities associated with scintillation, and the variability of their motion
Fluctuations are studied using amplitude scintillation and TEC data recorded by a GPS ionospheric scintillation and TEC receiver at Sanya
Summary
Ionospheric scintillation is a relatively rapid fluctuation of the amplitude phase of the radio signal and is mostly caused by irregularities in the ionospheric electron density along the path that the signal propagated. Employing the ROTI value, S4 index and estimated irregularity spectral index as the means of analyzing the TEC fluctuations, we have studied the spectral characteristics and transverse drift velocities of the scintillation-producing irregularities, the evolution of large- and small-scale irregularities associated with scintillation, and the variability of their motion.
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