An analytical full wave theory of whistler wave leakage from the densi
ty ducts and solitons, aligned parallel to the ambient magnetic field,
is developed. Radiation from plasma ducts and solitons are considered
from a unified standpoint. Explicit asymptotic expressions for the de
trapped radiation field and the amplitude attenuation, caused by the l
eakage, are obtained. The results are extended to more general gyrotro
pic media. (C) 1998 American Institute of Physics.