临近空间太阳紫外辐射环境模拟与地区差异

太阳紫外辐射是临近空间能量输入的主要来源之一，对其在中层大气的辐射特性进行研究，是研究临近空间大气成分与密度变化、光化学反应以及动力学过程的重要基础。依托“鸿鹄”临近空间探测专项计划，利用MODTRAN5辐射传输模型及卫星实测数据，模拟并对比中国11个主要地形区上空临近空间（20~50 km）紫外辐射（200~400 nm）垂直分布和季节演变的异同，计算了臭氧含量、太阳天顶角和日地距离等关键因素对辐射强度的影响。结果表明，各地形区的辐射流量垂直分布廓线和年较差垂直分布廓线较为一致，在地理位置上毗邻的地区辐射特性及季节演变较为接近，但在太阳紫外的不同波段之间区别较大。研究成果为临近空间探测实验提供了数据支撑，为大气反演等相关领域提供参考。

Simulation of Solar Ultraviolet Radiation Environment in Near Space and Analysis of Topographic Difference

Solar ultraviolet radiation is one of the main sources of energy input into near space. The study of its radiation characteristics in the mid-atmosphere is an important basis for the study of atmospheric composition and density changes, photochemical reactions and dynamic processes in near space. This paper is based on the special project of HH, using MODTRAN5 radiation transfer model and satellite ozone data, the similarities and differences of the vertical distribution and seasonal evolution of ultraviolet radiation (200~400 nm) in the near space (20~50 km) over 11 major terrain areas in China were compared. The function between ozone content and radiation transmittance is calculated, and the influence of solar zenithal Angle and sun-earth distance on radiation intensity is analyzed. The results show that the vertical distribution profiles of radiative flux in each terrain area are consistent with the vertical distribution profiles of the annual difference, and the radiation characteristics and seasonal evolution in geographically adjacent regions are similar, but there are great differences between different bands of solar UV. The results provide data support for near-space exploration experiments, and provide reference for atmospheric inversion and other related fields.