摘要: The solar 10.7 cm radio flux，F10.7，a measure of the solar radio flux per unit frequency at a wavelength of 10.7 cm，is a key and serviceable index for monitoring solar activities.The accurate prediction of F10.7 is of significant importance for short-term or long-term space weather forecasting. In this study，we apply Back Propagation （BP） neural network technique to forecast the daily F10.7 based on the trial data set of F10.7 from 1980 to 2001.Results show that this technique is better than the other prediction techniques for short-term forecasting，such as Support Vector Regression method.
摘要: 北斗卫星导航信号采用三个频点工作，可以利用伪距双频组差方法解算电离层电子含量，为实时监视中国区域电离层变化提供新的技术手段.中国中低纬度处于电离层赤道异常变化区，在北纬20°±5°区域时常发生较大梯度的电离层变化.利用北斗实时多频伪距和相位观测数据，采用相位平滑伪距方法计算电离层穿刺点电子含量，分析通过北斗系统GEO卫星监测的电离层周日变化特性；采用多面函数方法拟合中国区域1°×1°分辨率的电离层延迟量，每5min绘制一幅中国区域电离层图，观测区域所有电离层穿刺点拟合残差RMS为2.778TECU；分析北斗系统实时监测中国区域电离层异常情况，当发生电离层异常变化时，相邻两天的VTEC（Vertical Total Electronic Content）峰值相差约60TECU.
