基于FY-3C掩星数据偶发E层的研究

利用FY-3C极轨卫星提供的2014年6月至2015年5月的GPS无线电掩星数据,统计分析了全球范围内抽样频率为50 Hz的C/A码SNR扰动情况,进而对偶发E层进行了研究.结果表明:偶发E层在夏季半球中纬地区的扰动强度远远大于冬季半球同一纬度地区的扰动强度,偶发E层在纬度40°附近扰动明显增强;在E层100 km高度附近,Es层在10:00 LT和22:00 LT达到峰值;Es层在夏季半球的出现率明显高于冬季半球;FY-3C卫星的掩星观测结果与COSMIC系统的观测结果较一致,可以利用FY-3C卫星的掩星数据研究电离层偶发E层等的变化.

Study of Sporadic E Layers Based on Occultation Data Observed by FY-3C Satellite

Using the GPS radio occultation data from June 2014 to May 2015 provided by FY-3C polar-orbiting satellites,the SNR disturbances of C/A code with sampling frequency of 50 Hz on a global scale are statistically analyzed,and the disturbance strength of sporadic E layers is also studied.Results show that the disturbance strength of sporadic E layer at mid-latitudes in the summer hemisphere area is far greater than that at the same latitudes in the winter hemisphere,and the disturbances of the sporadic E layers (Es) near the latitude of 40° are significantly enhanced.In addition,at 100 km height,the disturbances of Es layers reach the peaks at 10:00 LT and 22:00 LT. The occurrence rates of sporadic E in summer hemisphere are significantly higher than that in the winter hemisphere.The results observed by FY-3C satellite are consistent with those observed by the COSMIC system.Therefore,the occultation data of FY-3C satellite could be used to study ionospheric sporadic E layers.