Optical turbulence outer scale and coherence outer scale at different astronomical sites

Abdelouahed Abahamid; Jean Vernin; Abdelhadi Jabiri; Zouhair Benkhaldoun

doi:10.1117/12.551533

28 September 2004 Optical turbulence outer scale and coherence outer scale at different astronomical sites

Abdelouahed Abahamid, Jean Vernin, Abdelhadi Jabiri, Zouhair Benkhaldoun

Proceedings Volume 5489, Ground-based Telescopes; (2004) https://doi.org/10.1117/12.551533
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

Abstract

Here we analyse 168 optical turbulence profiles made at nine different locations worldwide by means of free flight balloons equipped with instrumentation. Optical turbulence outer scales L_o, as well as coherence outer scales ℓ_o are derived for the different locations and taking into account the contribution of the surface layer [0, 50m], the boundary layer [0, 1km] and the free atmosphere [1km, 30km]. Noticeable changes are found between the different locations, mainly due to the boundary layer contribution. The free atmosphere contribution seems almost the same for each site. There is a very good coherence between the outer scale derived by us and that measured using the Generalized Seeing Monitor (GSM) technique.

Citation Download Citation

Abdelouahed Abahamid, Jean Vernin, Abdelhadi Jabiri, and Zouhair Benkhaldoun "Optical turbulence outer scale and coherence outer scale at different astronomical sites", Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); https://doi.org/10.1117/12.551533

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