The Mean Thickness of Night-time Es Clouds at Brisbane

Abstract

It has been stated that the sporadic E region of the ionosphere at Brisbane is very thin, with a maximum thickness of the order of a few hundred metres (McNicol and Gipps 1951). The measurements reported below indicate that at Brisbane Esc clouds (patches of enhanced ionization in the sporadic E region which maintain an almost constant height) at night are, on the average, almost certainly less than 1 km thick.