Abstract :
The experiments described show that, contrary to the usual assumption, reflection from the ionized layer plays a part in the propagation of long waves, even at relatively short distances. The intensity of the reflected wave is found to depend very markedly upon the direction of propagation, even for an aerial which appears to have no favoured direction of ground- wave transmission. For transmission from south to north the reflected wave is found to be stronger than for transmission from east to west, which strongly suggests that the earth´s magnetic field plays a part in the effect. The results appear to indicate a correlation between short- distance (under 400 km) and long-distance (over 1 000 km) observations, which is not found to exist when correlation is attempted with observations over medium distances.
