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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 10
Ann. Geophys., 27, 3811–3823, 2009
https://doi.org/10.5194/angeo-27-3811-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 3811–3823, 2009
https://doi.org/10.5194/angeo-27-3811-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  07 Oct 2009

07 Oct 2009

Lidar observations of sodium layer over low latitude, Gadanki (13.5° N, 79.2° E): seasonal and nocturnal variations

P. Vishnu Prasanth1, V. Sivakumar1,2,3, S. Sridharan4, Y. Bhavani Kumar4, H. Bencherif1, and D. Narayana Rao5 P. Vishnu Prasanth et al.
  • 1Laboratoire de l'Atmosphère et des Cyclones (LACy), UMR 8105, CNRS, Université de La Réunion, Reunion Island, France
  • 2National Laser Centre (NLC), Council for Scientific and Industrial Research (CSIR), P.O. Box 395, Pretoria 0001, South Africa
  • 3Department of Geography, Geoinformatics and~Meteorology, University of Pretoria, Lynwood Road, Pretoria 0002, South Africa
  • 4National Atmospheric Research Laboratory, Department of Space, Gadanki, India
  • 5SRM University, Kattankulathur, India

Abstract. In this paper, we present seasonal and nocturnal variations of mesospheric sodium (Na) layer parameters observed over Gadanki (13.5° N, 79.2° E), based on 166 nights during the period from January 2005 to December 2006, for the first time. The total Na content decreases during the evening and reaches a minimum value around midnight and maximum in the early morning. The year-to-year variations illustrate that Na layers reach the peak value close to 93.5 km for the year 2005 and ~93 km for the year 2006 and falls to near zero value around 110 km. Though, seasonal variation of sodium density illustrate maximum values in September, December and March, we require a larger data base for September months to conclude the statement. The column abundance shows maximum during autumn equinox and minimum during winter. The obtained seasonal and nocturnal variation of sodium layer parameters are compared with mid-latitude observations and further possible mechanisms are discussed.

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