中文摘要：

在 Wenchuan 地震前的电离层的行为与在厦门观察的全球侦探和 ionospheric foF2 被分析。它能从侦探被发现在2008年5月9日在下午( 16 18LT )印射那，在地震前的 3 天，有有出现在 Wenchuan 的东方南方方向的 10 15 TECU 的一个振幅的侦探的改进，并且另一改进与 10 的一个振幅出现在南部的半球的conjugate 区域 TECU ，而是没有明显的增长或减少能在全球规模上在另外的区域被看见。它能也在5月6日被发现那(在大地震前的 6 天)，与沿着在南部的中国的经度的 80 ° 有有 4TECU 和更大的区域的小振幅的侦探的减少，并且没有同步减少，在南部的半球的conjugate 区域观察。也有许多异例，电离层观测仪越过中国观察。结果证明 foF2 和侦探反常地增加了，它与 ionospheric 参数在地震以前减少了的能接受的结果不同。初步的结果建议改进也许在 5 月 9 日与 ionospheric 电场的可能的改进有一种靠近的关系，并且它可以是地震的一位 ionospheric 先锋。而减少可以在 5 月 6 日被归因于出现在 5 月 5 日的地磁气的骚乱。

英文摘要：

The behavior of the ionosphere before the Wenchuan earthquake is analyzed with the global TEC and ionospheric foF2 observed at Xiamen. It can be found from TEC maps that in the afternoon （16--18LT） on May 9, 2008, 3 days before the earthquake, there is an enhancement of TEC with an amplitude of 10--15 TECU appearing in the east-south direction of Wenchuan, and another enhancement appears at the conjugate region of the Southern Hemisphere with an amplitude of 10 TECU, but no obvious increment or decrement can be seen in other regions on global scale. It can also be found that on May 6 （6 days before the great earthquake）, there is a decrement of TEC with small amplitude of 4TECU and larger area with 80° along the longitude in southern China, and there is no synchronous decrement observed at the conjugate region of the Southern Hemisphere. There are also many anomalies observed by ionosondes across China. The result shows that foF2 and TEC abnormally increased, which is different from pervious results that ionospheric parameters decreased prior to earthquakes. Preliminary results suggest that the enhancement on May 9 maybe has a close relationship with the possible enhancement of ionospheric electric fields, and it may be an ionospheric precursor of earth-quakes. Whereas the decrement on May 6 may be attributed to the geomagnetic disturbance appearing on May 5.