海南地区电离层不规则体纬向漂移速度的观测和研究

Observations of Ionospheric Irregularity Zonal Velocity in Hainan

根据中国海南富克(19.3°N,109.1°E)三点GPS观测系统2007年3月至11月的观测数据,利用互相关方法分析了三站闪烁信号的时间延迟,得出了不规则体纬向漂移的基本特征.在中国海南地区,闪烁主要发生在春秋季节,夜间不规则体的纬向漂移速度以东向为主,大小在50～150 m/s之间;平均东向漂移速度随时间呈下降趋势.另外,在闪烁刚发生时,不规则体纬向速度起伏较大,这可能与不规则体的随机起伏以及等离子体泡产生时垂直速度较大有关.中国海南地区不规则体纬向漂移速度的这些基本特征与低纬其他地区的测量结果较为一致.

To investigate the drift velocity of the equatorial ionospheric irregularity in low latitude of China, three single-frequency GPS receivers at Hainan （19.3°N, 109.1°E） were operated under the corporation of CSSAR, China and NICT, Japan. Distances between the receivers were 91m and 104 m respectively. The GPS receivers sampled GPS signal intensity at a rate of 20Hz. Drift velocities of irregularities were measured using cross-correlation analysis with the time series of the GPS signal intensity observed from March to November of 2007. The results indicate that the ionospheric scintillation mainly occurrs in spring and autumn. The zonal drift velocity is mainly eastward at night. It varis from 50m/s to 150m/s, and decreases with time. During the generation phase of plasma bubbles, the drift velocity is relatively scattered, which could be related to the random fluctuations of the plasma irregularities. And at the beginning of the scintillation, the plasma has a large vertical velocity, which can also cause the uncertainty of the zonal drift velocity. The characteristic of the drift velocity is consistent with the observational results in other stations at low latitude region.