Figure 5From: A case study on occurrence of an unusual structure in the sodium layer over Gadanki, India Zonal and meridional winds during 18:00 to 19:00 IST. This highlights the zonal (upper panel) and meridional (lower panel) wind during 18:00 to 19:00 IST when Ri remains less than 0.25, conditions conducive for the growth of dynamical instabilities.Back to article page