Abstract
Previous papers1 have pointed out the probable existence of a correlation between the intensity of radio reception and the Moon's position in the observer's sky at the time the intensity‐measurements are made. Corroborating evidence has come from subsequent investigations by Pickard2 and by Kenrick and Pickard,3 as to the reality of the lunar effect. The variation in intensity considered implies a rise and fall in the Kennelly‐Heaviside Layer, or an equivalent change in the electrondensity of the ionosphere, which assumes the appearance of an electronic tide. It was pointed out in the first paper mentioned that such might be caused either by the Moon's gravitational effect on the upper atmospheric layers or by some unknown effect of the Moon acting as an ionizing agent, such, for example, as would be the case were the Moon to possess an appreciable electrostatic charge.
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