%0 Journal Article
%T Diurnal variation of short-period (20每120 min) gravity waves in the equatorial Mesosphere and Lower Thermosphere and its relation to deep tropical convection
%A N. Venkateswara Rao
%A Y. Shibagaki
%A T. Tsuda
%J Annales Geophysicae (ANGEO)
%D 2011
%I Copernicus Publications
%X We study short period gravity waves (20每120 min) in the equatorial Mesosphere and Lower Thermosphere (MLT) using a Medium Frequency (MF) radar at Pameungpeuk (7.4∼ S, 107.4∼ E), Indonesia. In particular, we study local time and seasonal variation of the gravity wave variance and its relation to tropical convection. The gravity wave variance at 88 km enhances between 20:00 LT and 07:00 LT, with a peak at 02:00每03:00 LT. The enhancement is mainly observed during February每April and September每October and shows inter-annual variability. Convective activity over the same location persists from 16:00每21:00 LT with a peak activity ~18:00 LT and enhances between November每April. Time delay between the peak of convection and that of gravity wave activity ranges 1每15 h, which is consistent with theoretical calculations and previous reports based on reverse ray tracing analysis.
%U http://www.ann-geophys.net/29/623/2011/angeo-29-623-2011.html