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Volume 61 Supplement 4

Special Issue: Coupling Processes in the Equatorial Atmosphere (CPEA)

Radar observations of the diurnal tide in the tropical mesosphere-lower thermosphere region: Longitudinal variabilities

Earth, Planets and Space volume 61, pages 513–524 (2009)Cite this article

Abstract

Significant attention is being paid in recent times by several observational and modeling studies to quantify the spatial and temporal variabilities of diurnal tide in the mesosphere and lower thermosphere (MLT) region. These variabilities are ascribed to spatial and temporal variations in the tidal forcing or interactions between the propagating tides and background wind, planetary waves or gravity waves. The present work makes use of simultaneous ground-based radar wind observations of different durations from five equatorial/low latitude sites in the Indian, Indonesian and Pacific sectors: Tirunelveli (8.7°N, 77.8°E), Jakarta (6.4°S, 106.7°E), Pontianak (0.03°N, 109°E), Kauai (22°N, 160°W) and Christmas Island (2°N, 157°W). This study delineates the longitudinal differences in the tidal characteristics in (i) interannual time scales over Tirunelveli and Kauai during 1993–2002, (ii) seasonal time scales over Christmas Island, Jakarta and Tirunelveli for the years 1993–1997 and (iii) shorter than seasonal time scales over Christmas Island, Pontianak and Tirunelveli during 1996–1997. An important observational feature noticed in this work is the differing behavior of the long-term tidal fields over Tirunelveli and Kauai. The monthly tidal amplitudes over Tirunelveli reveal a strong QBO signature whereas a similar, strong QBO signal could not be traced in the long-term observations from Kauai.

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Authors and Affiliations

  1. Equatorial Geophysical Research Laboratory, Indian Institute of Geomagnetism, Tirunelveli, India

    S. Gurubaran & R. Rajaram

  2. Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan

    T. Nakamura & T. Tsuda

  3. Colorado Research Associates, Boulder, USA

    D. Riggin

  4. Department of Physics and Mathematical Physics, University of Adelaide, Australia

    R. A. Vincent

Authors
  1. S. Gurubaran
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  2. R. Rajaram
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  3. T. Nakamura
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  4. T. Tsuda
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  5. D. Riggin
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  6. R. A. Vincent
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Correspondence to S. Gurubaran.

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Gurubaran, S., Rajaram, R., Nakamura, T. et al. Radar observations of the diurnal tide in the tropical mesosphere-lower thermosphere region: Longitudinal variabilities. Earth Planet Sp 61, 513–524 (2009). https://doi.org/10.1186/BF03353168

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  • DOI: https://doi.org/10.1186/BF03353168

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