371-379In
this paper, nighttime mesospheric OH and O2 temperature variability
over Gadanki, a low latitude station in the Indian sector during February 2010
have been studied. It has been noted that mesospheric wave amplitudes show
large variability from one night to the other. Occasionally, the mesospheric
waves show larger amplitudes in O2 data compared to the amplitudes
of similar period waves in OH data indicating the amplification in wave
amplitudes. For the waves noted simultaneously at OH and O2 data,
the damping factors have been calculated. The analysis reveals a highly dynamic
upper mesosphere with some of the waves showing upward propagation (damping
factor < 1), some reaching to their saturation levels (damping factor ~1)
and few waves getting strongly damped (damping factor >1)