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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 29, issue 4
Ann. Geophys., 29, 623–629, 2011
https://doi.org/10.5194/angeo-29-623-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 29, 623–629, 2011
https://doi.org/10.5194/angeo-29-623-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

ANGEO Communicates 01 Apr 2011

ANGEO Communicates | 01 Apr 2011

Diurnal variation of short-period (20–120 min) gravity waves in the equatorial Mesosphere and Lower Thermosphere and its relation to deep tropical convection

N. Venkateswara Rao1, Y. Shibagaki2, and T. Tsuda1 N. Venkateswara Rao et al.
  • 1Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan
  • 2Faculty of Information and Communication Engineering, Osaka Electro-Communication University, Neyagawa, Japan

Abstract. We study short period gravity waves (20–120 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 02:00–03:00 LT. The enhancement is mainly observed during February–April and September–October and shows inter-annual variability. Convective activity over the same location persists from 16:00–21:00 LT with a peak activity ~18:00 LT and enhances between November–April. Time delay between the peak of convection and that of gravity wave activity ranges 1–15 h, which is consistent with theoretical calculations and previous reports based on reverse ray tracing analysis.

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