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统计分析了 1997～ 2 0 0 0年合肥地区一复杂地形处近地面折射率结构常数 C2n 的测量数据。给出了不同下垫面、不同季节、不同高度上 C2n 的统计结果。白天 C2n 强弱依次为 6月、5月、4月、9月、1月。白天水面上 C2n 比草地上小 ,夜间比草地上大。不论白天还是夜晚 ,近地面 C2n都随高度递减 ,且 3～10 m高的 C2n 递减较慢 ,10～ 15 m高的 C2n 递减较快。C2n随月份的日变化与模式计算结果基本一致。
The data of the near-surface refractive index structure constant C2n from 1997 to 2000 in a complex terrain were statistically analyzed. The statistical results of C2n at different underlying surfaces, different seasons and altitudes are given. During the day, the strength of C2n was June, May, April, September and January. In the daytime, C2n is smaller than grassland and larger than grassland at night. Both daytime and nighttime, the near-surface C2n decreases with height, and the C2n decreases slowly from 3 to 10 m in height, while C2n decreases rapidly from 10 to 15 m in height. The diurnal variation of C2n with the month is basically the same as that of the model.