Anomalous enhancement of electric field derived from ionosonde data before the great Wenchuan earthquake |
| |
| Authors: | Tong Xu Yanli Hu Jian Wu Zhensen Wu Chunbin Li Zhenwen Xu Yucheng Suo |
| |
| Institution: | 1. National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China;2. School of Science, Xidian University, Shannxi, Xi’an 710071, China |
| |
| Abstract: | The seismo-ionospheric coupling is a hot topic of modern scientific research. One of the most reasonable mechanisms is the hypothesis of quasistatic electric field. With a preliminary analytical method, electric field in F2-region before Wenchuan earthquake was derived from the five lower latitude ground-based ionosondes: Lhasa (29.63°N, 91.17°E), Chongqing (29.50°N, 106.40°E), Kunming (25.00°N, 102.70°E), Guangzhou (23.15°N, 113.35°E) and Haikou (23.15°N, 110.35°E). The results show that there was an anomalous enhancement of electric field in F2-region close to the epicenter with maximal amplitude ∼2 mV/m (about 10 times of the background) at 15:00 LT on 9 May, which is in line with the amplitudes of anomalous electric field related to some previous earthquakes observed by satellites. |
| |
| Keywords: | Seismo-ionospheric coupling Ionospheric disturbances Anomalous electric field |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
