中文摘要：

利用多个电离层垂测站的数据和IGS-TEC数据资料,结合日地空间环境指数,分析了2009年7月22日日全食期间中国地区电离层参量（反射回波最低频率f_（min）及f_0f_2和TEC）的变化特征.结果表明,日食发生后f_（min）迅速降低,日食结束后f_（min）迅速恢复到正常水平;在食甚时刻附近,F_0f_2和TEC出现明显的降低,显示了明显的光食效应.日食结束后5～6 h,f_0f_2和TEC出现不同程度的正扰动,在驼峰区更明显;日食结束后9～10 h,f_0f_2和TEC出现较显著的负扰动.由于此次日食发生时伴随着中等强度的磁暴和低纬电场穿透等空间天气事件,给此次日食电离层效应的深入分析带来很大困难.

英文摘要：

The variations of ionospheric parameters including f_（min）,f_0F_2 and TEC during the total solar eclipse of 22 July 2009 are investigated.The results show that the f_（min） drops quickly after the eclipse commencement and then gradually restores to the normal value.The f_0F_2 and TEC decrease greatly during the eclipse maximum.These phenomena are probably caused by the fact that the solar electromagnetic radiation decrease sharply during the solar eclipse.The f_0F_2 and TEC show some positive disturbance which is more notable near to the equatorial abnormal crest region on about 5～6 hours and some negative disturbance on about 9～10 hours after this eclipse.Combining the analysis of the solar and geomagnetic activity,we think that it seems difficult to further investigate the eclipse ionospheric effect since the space weather events including magnetic storm and electric field penetration arc accompanying this event.