“…Later, at high, mid and low latitudes, both satellite and ground-based whistler data were exploited to reveal new facts about the structure and dynamics of the ionosphere and magnetosphere. These achievements included the discovery of the plasmaspheric, plasmapause, and bulge (Carpenter and Park, 1973), identification of the mechanisms of the ionosphereprotonoshphere coupling (Park, 1970;Andrews, 1980, Lalmani et al, 1992, 1996, Singh et al, 1998, measurement of magnetospheric electric field (Carpenter et al, 1972;Misra et al, 1980;Lalmani et al, 1982) and electron temperature (Sazhin et al, 1990(Sazhin et al, , 1992(Sazhin et al, , 1993Singh et al, 2008) etc. Further, a wide variety of whistlers recorded during day and nighttimes at low latitude ground stations are markedly different from those recorded at middle and high latitudes.…”