Journal
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
Volume 71, Issue 5, Pages 575-582Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jastp.2008.12.002
Keywords
Resonance lidar; Sporadic sodium layers; Meteor radar; Wind shear
Funding
- Department of Space
- Government of India
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Resonance lidar observations of sodium density in the upper mesosphere region over Gadanki (13.5 degrees N, 79.2 degrees E) rarely show complex structures with rapid enhancements of sodium density, completely different from normal sporadic sodium structures. The hourly averaged meteor radar zonal winds over Trivandrum (8.5 degrees N, 76.5 degrees E) show an eastward shear with altitude during the nights, when these events are formed. As suggested by Kane et al. [2001. joint observations of sodium enhancements and field-aligned ionospheric irregularities. Geophysical Research Letters 28, 1375-1378], our observations show that the complex structures may be formed due to Kelvin-Helmholtz instability, which can occur in the region of strong wind shear. (C) 2009 Elsevier Ltd. All rights reserved.
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