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鉴于背景亮度对于能见度和跑道视程的重要作用,本文通过对石家庄机场近4年的自观探测资料进行处理,对背景亮度这一要素值进行了统计分析,得到了背景亮度的日变化曲线,背景亮度日极值的年变化曲线,以及背景亮度的日变化何年变化的变化规律;此外分析还表明:背景亮度的变化受太阳高度角夹角的变化和大气介质变化的影响。
In view of the important effect of background brightness on visibility and runway visibility, this paper analyzes the elemental values of background brightness by processing self-observation data of Shijiazhuang Airport for nearly 4 years and obtains the diurnal variation curve of background brightness. The annual variation curve of the background brightness and the change rule of the daily variation of the background brightness. In addition, the analysis also shows that the variation of the background brightness is affected by the variation of the solar elevation angle and the atmospheric medium.