“…size, lifetime, separation etc. from the available whistler data (Somyajulu et al, 1972;Rao and Lalmani, 1975;Khosa et al,1983;Lalmani, 1984;Hayakawa et al, 1985Hayakawa et al, , 1990Singh, 1993;Singh et al,1998Singh et al, , 2013. Both the duct efficiency and scatter in the duct efficiency are observed to increase with Kp.…”