Figure 4
From: A case study on occurrence of an unusual structure in the sodium layer over Gadanki, India
Zonal and meridional winds on 18 to 19 March 2007 (SPL,Thiruvananthapuram). (a, b) Zonal and meridional wind profiles during 18 to 19 March 2007 derived from the meteor radar at SPL, Thiruvananthapuram. (c) The altitude variation of R i at different times over Thiruvananthapuram calculated using total wind shear and the average temperature profile from SABER 1,2 which are the closest SABER passes to Thiruvananthapuram. (d) Average zonal and meridional wind profiles showing the horizontal background wind above 92 km is northeastward with a mean speed of approximately 58 m/s.