摘要
利用COSMIC和CHAMP掩星的电离层掩星资料研究汶川大地震引起的电离层响应。选取了2008年4月30日到5月18日共19天的北纬20°到40°,东经80°到120°的共309个掩星数据进行分析。采用人工神经网络插值技术,分析震中附近上空电离层F2区的临界频率的日变化。结果表明:震前6天电离层F2区的临界频率和电子密度的峰值高度开始明显下降,在震前的三天内其值达到最小。震后他它们的值开始逐步回升。
Ionospheric response caused by Wenchuan earthquake is analyzed using by COSMIC and CHAMP occulted data, from April 30, 2008 to May 18 altogether 19 days, including 20°N to 40°N, 80° to 120°E altogether 309 occulted events, and daily variations of the F2 region critical frequency over the epicenter are researched using a back-propagation artificial neural network. The results indicated that the critical frequencies in F2 region start obviously to drop before 6 days of this earthquake, and they achieved the minimum value before 3 days. Then, these values raised again gradually.
出处
《全球定位系统》
2008年第5期1-5,共5页
Gnss World of China
关键词
电离层F层
地震电离层响应
GPS人工神经网络
Ionospheric F2 region
ionospheric response of the earthquake
GPS
artificial neural network
