用红外辐射计测定大气气溶胶含量
Determining Atmospheric Aerosol Content With An Infra-red Radiometer
摘要:
切伦科夫光子的大气衰减主要由两个过程控制:分子组分的瑞利散射和气溶胶组分的米氏散射。预计气溶胶对大气排放剖面的贡献高达30 Wm $^{-2}$,相当于正常条件下与晴朗天空亮度温度相差约20 C。在这里,我们调查的气溶胶的贡献,在H.E.S.S.站点;将其与望远镜触发率的有效变化进行比较;并讨论如何使用它来提供明确的无望远镜系统学的天空清晰度评估。
英文摘要:
The atmospheric attenuation of Cherenkov photons is dominated by two processes: Rayleigh scattering from the molecular component and Mie scattering from the aerosol component. Aerosols are expected to contribute up to 30 Wm$^{-2}$ to the emission profile of the atmosphere, equivalent to a difference of ~20C to the clear sky brightness temperature under normal conditions. Here we investigate the aerosol contribution of the measured sky brightness temperature at the H.E.S.S. site; compare it to effective changes in the telescope trigger rates; and discuss how it can be used to provide an assessment of sky clarity that is unambiguously free of telescope systematics.
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