Abstract
Amateur radio operators communicate from time to time by a phenomenon of anomalous ionospheric propagation associated with the aurora borealis. Measurements have been made of the rapid flutter-type of fading associated with this kind of propagation at 50 Mc/sec. The power-spectrum of the fading seems to have frequency-components of roughly equal strength from zero frequency to a cut-off frequency between 100 and 200 cycles/sec. The fading frequency is thus about a power of ten greater than might be anticipated from usual ionospheric velocities. In most cases, both transmitting and receiving antennas must be of the same polarization and must both be pointed more or less in the direction of the visible aurora. Amplitude modulated speech-transmission is occasionally possible at 50 Mc/sec by means of this type of propagation.
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