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Determining Atmospheric Aerosol Content With An Infra-red Radiometer

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arxiv 1402.4739 v2 pith:ERAMGIPA submitted 2014-02-19 astro-ph.IM

Determining Atmospheric Aerosol Content With An Infra-red Radiometer

classification astro-ph.IM
keywords aerosolatmosphericbrightnesscomponentscatteringtelescopetemperatureaerosols
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

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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