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Proceedings Paper

Astronomical observation through the NIR atmospheric emissive layer
Author(s): Guy Moreels; Michael Faivre; Olivier Lorin; Dominique Pautet; Francois Colas; Jacques Clairemidi
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Paper Abstract

The emission of the upper atmosphere introduces an additional component into photometric observations of astronomical objects. In the I band for instance, the intensity of the atmospheric emission is of the order of 1 to 2 Imag20 per square arcsecond. The subtraction of this component is not easy because it varies during the night by as much as 50% and it is not homogeneous over the sky. A program aimed at understanding the main characteristics of the atmospheric emission was undertaken. A set of CCD images of the OH emission in the I band covering the sky was assembled in a panorama, it shows wide converging arches. An algorithm was developed in order to invert the perspective projection of the photographs. The result is a 2200 km wide view over Europe and Mediterranean Sea of the emission as seen from a virtual satellite. This image shows the presence of an extended wave field. A Fourier analysis allows to infer mean horizontal wavelength, mean temporal period and horizontal phase velocity. The atmospheric emission varies under the influence of atmospheric waves. A stereoscopic imaging program is currently under development to measure the amplitude and the energy of the atmospheric waves.

Paper Details

Date Published: 30 September 2004
PDF: 10 pages
Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); doi: 10.1117/12.550838
Show Author Affiliations
Guy Moreels, Observatoire de Besancon (France)
Michael Faivre, Clemson Univ. (United States)
Olivier Lorin, Observatoire de Besancon (France)
Dominique Pautet, Utah State Univ. (United States)
Francois Colas, Observatoire de Paris (France)
Jacques Clairemidi, Observatoire de Besancon (France)


Published in SPIE Proceedings Vol. 5492:
Ground-based Instrumentation for Astronomy
Alan F. M. Moorwood; Masanori Iye, Editor(s)

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