抄録
The possibility that VLF hiss observed at low latitudes is a consequence of waveguide mode propagation of energy from sources located in the auroral zone is examined in some detail. From the locii of the hypothetical point sources which would yield the observed power ratios for any given pair of stations, it is found that sources located in a region around the auroral zone can explain the observations at all stations. It is also shown that the accepted values of the dominant mode attenuation in the terrestrial waveguide can explain the observed hiss spectral densities at low latitudes only if we assume the presence of an extended source along the auroral zone.
