%0 Journal Article %T Chemistry of Upper Ionosphere-A Study %A Bindu Mangla %A Manikant Yadav %J International Journal of Advances in Engineering Sciences %D 2011 %I RG Education Society %X In the upper ionosphere (above about 200 or 250 km) electron and ion concentrations are not governed solely by considerations of photochemical equilibrium, because the rates of diffusion of ions and electrons are comparable with the rates of chemical loss processes. Thus the position of F2 peak is governed by the competition between chemical recombination and diffusion %U http://rgjournals.com/index.php/ijse/article/view/61