Astronomical observation through the NIR atmospheric emissive layer

Guy Moreels; Michael Faivre; Olivier Lorin; Dominique Pautet; Francois Colas; Jacques Clairemidi

doi:10.1117/12.550838

30 September 2004 Astronomical observation through the NIR atmospheric emissive layer

Guy Moreels, Michael Faivre, Olivier Lorin, Dominique Pautet, Francois Colas, Jacques Clairemidi

Proceedings Volume 5492, Ground-based Instrumentation for Astronomy; (2004) https://doi.org/10.1117/12.550838
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

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.

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Guy Moreels, Michael Faivre, Olivier Lorin, Dominique Pautet, Francois Colas, and Jacques Clairemidi "Astronomical observation through the NIR atmospheric emissive layer", Proc. SPIE 5492, Ground-based Instrumentation for Astronomy, (30 September 2004); https://doi.org/10.1117/12.550838

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KEYWORDS

Photonic integrated circuits

Astronomy

Cameras

Atmospheric propagation

Infrared imaging

Near infrared

CCD cameras

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