中文摘要：

利用慢电场变化测量仪所获取的观测资料详细分析了大兴安岭地区地闪回击辐射场特征。结果表明,35次正地闪首次回击的慢前沿、10%～90%平均上升时间分别为7.8μs、4.5μs,其中11次正地闪首次回击的过零时间、负反冲深度平均值分别为34μs、23%。76次负地闪首次回击的慢前沿、10%～90%平均上升时间分别为3.5μs、1.9μs,继后回击的慢前沿为1.4μs,其中15次负地闪首次回击的过零时间、负反冲深度平均值分别为51μs、52%。另外,正地闪首次回击的半峰值宽度大于负地闪首次回击,平均值分别为13.6μs、5.6μs。与国内外已有结果的进一步对比发现,大兴安岭地区的地闪回击辐射场特征与瑞典、美国弗罗里达的地闪回击辐射场特征有较好的一致性,但与我国内陆高原的地闪辐射场特征有明显差异。

英文摘要：

The radiation field characteristics of cloud-to-ground（CG） lightning flashes in the Daxing’an Mountain Range are analyzed and compared with those of other researches from home and abroad by using the data obtained from a broadband slow antenna system with a high time resolution.It is found that for 35 positive CG flashes,the average duration of the slow-change period and the 10% to 90% rising period for the first return strokes are 7.8 μs and 4.5 μs,respectively,in 11 of which the average crossing time and overshoot depth are 34 μs and 23%,respectively;for 76 negative CG flashes,those are 3.5 μs and 1.9 μs,respectively,in 15 of which the crossing time and overshoot depth are 51 μs and 52%,respectively.The average half peak width of first return strokes of positive CG flashes is larger than that of negative CG flashes,with the average values being 13.6 μs and 5.6 μs.Compared with other observations both from home and abroad,the characteristics of radiation fields of return strokes of CG flashes at the Daxing’an Mountain Range are similar with those in Sweden and Florida of America,but different from those on the Qinghai-Tibet plateau.