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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 8
Ann. Geophys., 25, 1759–1766, 2007
https://doi.org/10.5194/angeo-25-1759-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 1759–1766, 2007
https://doi.org/10.5194/angeo-25-1759-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Aug 2007

29 Aug 2007

Lidar observations of sporadic Na layers over Gadanki (13.5° N, 79.2° E)

P. Vishnu Prasanth, S. Sridharan, Y. Bhavani Kumar, and D. Narayana Rao P. Vishnu Prasanth et al.
  • National Atmospheric Research Laboratory, Gadanki-517 112, Pakala Mandal, Chitoor District, Andhra Pradesh, India

Abstract. We studied the characteristics of sporadic sodium layers (SSLs) observed with the sodium (Na) resonance scattering lidar at Gadanki (13.5° N, 79.2° E). The SSLs were observed on a total of 63 occasions during 464 h of Na lidar observations from January 2005 to February 2006. The observations showed that one SSL event occurred, on average, every 7 h. The most prominent sporadic layer, which formed on 12 February 2005, exhibited a peak density of 60 722 Na atoms/cm³ around 92 km and it was nearly twice the peak density reported from elsewhere using ground-based observations. In general, the SSLs exhibited the following characteristics: (1) they developed at heights between 88 and 98 km with an average height around 94 km; (2) maximum density occurred during the early morning hours between 02:00 and 05:00 IST; (3) the ratio of the maximum peak Na density to the average density was normally around 3 to 5 and it exceeded even 10 in some cases; (4) the events lasted from a few minutes to several hours. The formation period of the SSLs was longer compared to the decay period of the SSLs. Most of the SSL events showed downward motions.

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