Abstract
It has long been known that the records of the terrestrial magnetic elements obtained by the magnetograph of high sensibility show as a rule numerous trains of more or less regular waves which are called the “ micropulsations ” or “Elementarwellen.” Prof. T Terada pointed out in 1917, that in this kind of terrestrial magnetic variations there occur sometimes a characteristic train of micropuslsations showing a feature like that of “beats” in acoustics. In this paper, is proposed a provisory explanation based on the more or less vertical oscillation of “Kennelly-Heaviside layers.”
