“…The ablation of meteors at the mesopause region results in the formation of the sodium layer [Plane, 1991]. Due to the fact that it has a large scattering cross section and also that it acts as a tracer for the thermal and dynamical states of the atmosphere in this altitude range [Plane et al, 1999;Griffins et al, 2001], the mesospheric sodium has been studied extensively among all meteoric metals [Kirchhoff et al, 1981;Kirchhoff , 1986;Plane, 1991;Clemesha et al, 1995;Hecht et al, 2000;Plane et al, 1999;Griffins et al, 2001;Slanger et al, 2005;Fan et al, 2007;Clemesha et al, 2010;Plane et al, 2012;Hossain et al, 2014]. The peak density layer exists at around 90 km.…”