作者机构:[1]National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China, [2]School of Science, Xidian University, Xi'an 710071, China
相关基金:Acknowledgments We are grateful to Prof. Cesar and Dr. Rietveld for assisting with the experiment. This work was supported by the National Natural Science Foundation of China (Grant nos. 40831062, 41004065), National Supportive Project of Science and Technology of China (Grant no 2006BAB18B06), the State Key Laboratory of Space Weather (Grant no. 08262DAA4S) and National Key Laboratory of Electromagnetic Environment.