The amplitude of the electromagnetic field radiated (as an imposed antenna
current) by a semi-infinite rarefied nonmonoenergetic electron beam artific
ially injected from a satellite into the Earth ionosphere is calculated far
from the injection point (near the remote receiver) by the use of a two-di
mensional Stationary Phase Point method. The Stationary Phase Point, which
gives the main contribution to the radiated field near the remote receiver,
is defined by two variables: the parallel beam velocity u and the frequenc
y w of the radiated signal.. The size of its vicinity, {delta u, delta w}(2
D), governing the wave packet amplitude far from the beam, is inversely pro
portional to the transverse distance of the receiver to the beam axis. A qu
alitative scheme of formation of the wave field near the remote receiver is
discussed for different Limiting cases on the level of beam monoenergetici
ty and spectral characteristics of the remote receiver.