Determining atmospheric aerosol content with an infra-red radiometer

10 Jun 2013, 14:45
Galileo Room, Building 713C (CEA Saclay)

Galileo Room, Building 713C

CEA Saclay

Talk Monitoring facilities in operation Monday afternoon 1


Dr Michael Daniel (University of Liverpool)


The attenuation of atmospheric 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.

Primary author

Dr Michael Daniel (University of Liverpool)

Presentation Materials