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Atmospheric sensing for the H.E.S.S. array

Aye, K.-M.; Brown, A.M.; Chadwick, P.M.; Hadjichristidis, C.; Latham, I.J.; Le Gallou, R.; Mc Comb, T.J.L.; Nolan, S.J.; Noutsos, A.; Orford, K.J.; Osborne, J.L.; Rayner, S.M.; Collaboration, Hess


K.-M. Aye

A.M. Brown

C. Hadjichristidis

I.J. Latham

R. Le Gallou

T.J.L. Mc Comb

A. Noutsos

K.J. Orford

S.M. Rayner

Hess Collaboration


Felix A. Aharonian

Heinz Völk

Dieter Horns


Several atmospheric monitoring instruments have been installed at the H.E.S.S. gamma‐ray observatory in Namibia. Firstly, Heitronics KT19 infrared radiometers, aligned paraxially with the H.E.S.S. telescopes, measure the infrared radiation of the water molecules. These allow us to detect clouds crossing the telescopes’ field of view and to estimate the humidity present in the atmosphere. For a general estimate of the atmosphere’s transmittance, i.e. the detection of any light‐attenuating aerosols, a ceilometer, which is a LIDAR with built‐in atmospheric data reduction code, is being used. It will be complemented soon by an instrument which will measure the transmissivity of the atmosphere at different wavelengths up to 500m above the ground. The overall status of the weather is monitored by a fully automated weatherstation. This paper describes the setup, the data analysis and how this will be used in order to improve the knowledge of the telescopes’ effective collection area.

Presentation Conference Type Conference Paper (Published)
Conference Name 2nd International Symposium on High Energy Gamma-Ray Astronomy
Publication Date 2005-02
Publisher American Institute of Physics
Volume 745
Pages 724-729
Series Title AIP conference proceedings
Book Title High energy gamma-ray astronomy: 2nd International Symposium on High Energy Gamma-Ray Astronomy, Heidelberg, Germany, 26-30 July 2004
Public URL