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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 12
Ann. Geophys., 24, 3229–3240, 2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 3229–3240, 2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  21 Dec 2006

21 Dec 2006

Mesospheric gravity waves observed near equatorial and low–middle latitude stations: wave characteristics and reverse ray tracing results

C. M. Wrasse1, T. Nakamura2, H. Takahashi1, A. F. Medeiros3, M. J. Taylor4, D. Gobbi1, C. M. Denardini1, J. Fechine1, R. A. Buriti3, A. Salatun5, Suratno5, E. Achmad5, and A. G. Admiranto5 C. M. Wrasse et al.
  • 1Instituto Nacional de Pesquisas Espaciais (INPE), C.P. 515, 12245-970, São José dos Campos, Brazil
  • 2Institute for Sustainable Humanosphere (RISH), Kyoto University, Uji, Kyoto, 611-0011, Japan
  • 3Universidade Federal de Campina Grande (UFCG), Av. Aprígio Veloso 882, Bodocongó, 58109-970, Campina Grande, Brazil
  • 4Space Dynamics Laboratory and Physics Department, Logan, UT 84322-4145, USA
  • 5Space Science Center, National Institute of Aeronautics and Space, Jalan Pemuda Persil 1, Rawamangun, 13220, Jakarta, Indonesia

Abstract. Gravity wave signatures were extracted from OH airglow observations using all-sky CCD imagers at four different stations: Cachoeira Paulista (CP) (22.7° S, 45° W) and São João do Cariri (7.4° S, 36.5° W), Brazil; Tanjungsari (TJS) (6.9° S, 107.9° E), Indonesia and Shigaraki (34.9° N, 136° E), Japan. The gravity wave parameters are used as an input in a reverse ray tracing model to study the gravity wave vertical propagation trajectory and to estimate the wave source region. Gravity waves observed near the equator showed a shorter period and a larger phase velocity than those waves observed at low-middle latitudes. The waves ray traced down into the troposphere showed the largest horizontal wavelength and phase speed. The ray tracing results also showed that at CP, Cariri and Shigaraki the majority of the ray paths stopped in the mesosphere due to the condition of m2<0, while at TJS most of the waves are traced back into the troposphere. In summer time, most of the back traced waves have their final position stopped in the mesosphere due to m2<0 or critical level interactions (|m|→∞), which suggests the presence of ducting waves and/or waves generated in-situ. In the troposphere, the possible gravity wave sources are related to meteorological front activities and cloud convections at CP, while at Cariri and TJS tropical cloud convections near the equator are the most probable gravity wave sources. The tropospheric jet stream and the orography are thought to be the major responsible sources for the waves observed at Shigaraki.

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