The results of two experiments dealing with VH7 radio echoes “associated with aurora” are described. In the firsts most of the echoes are shown to come directly from ionization in the near vicinity of some visible forms. Echoes are obtained from homogeneous, rayed and pulsating forms. However, there is little relation between the luminosity of the forms and the intensity of the radio signals. The range and azimuth distributions of the echoes are shown to be consistent with a propagation mechanism involving ionized columns as scattering centers. The columns should lie parallel to the lines of force of the earth's magnetic field.
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