Observations of peculiar sporadic sodium structures and their relation with wind variations |
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| Authors: | S Sridharan P Vishnu Prasanth Y Bhavani Kumar Geetha Ramkumar S Sathishkumar K Raghunath |
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| Institution: | 1. Department of Physics, Ariel University, Ariel, Israel;2. Eastern R&D Center, Ariel, Israel;3. School of Sustainability, Interdisciplinary Center (IDC) Herzliya, Israel;4. Weather it is, LTD, Efrat, Israel |
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| Abstract: | Resonance lidar observations of sodium density in the upper mesosphere region over Gadanki (13.5°N, 79.2°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°N, 76.5°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. |
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