A number of studies have shown that 5-day planetary waves modulate noctilucent clouds and the closely related Polar Mesosphere Summer Echoes (PMSE) at the summer mesopause. Summer stratospheric winds should inhibit wave propagation through the stratosphere and. although some numerical models (Geisler and Dickinson. 1976) do show a possibility for upward wave propagation. https://www.roneverhart.com/Lycogel-Breathable-Concealer/