Electron collision frequency in the ionospheric D region

Abstract

A brief r eview of the ionosph eric D r egion electron collision fr eq uency inform at ion that is ava ilable from ro cket obser vations a nd laboratory in vestigatio ns indicates that the equation um= 8.40 X 10 7 P (m m Hg) is accmate 'l'ithin about ± 10 percent in t he portion of the D region above 40 km. The r es ults of the cross-m odulation experiment at Co ll egE', Alaska, arE' in agreement with t llis eq uation .