Statistics of the sodium layer parameters at low geographic latitude and its impact on adaptive-optics sodium laser guide star characteristicsN. Moussaoui, B. R. Clemesha, R. Holzlöhner, D. M. Simonich, D. Bonaccini Calia, W. Hackenberg and P. P. BatistaA&A, 511 (2010) A31DOI: https://doi.org/10.1051/0004-6361/200913281